update mergin_ to mm_ variables

src/field/tracking/index.md

@@ -30,7 +30,7 @@ Enabled tracking means that a new line layer for tracking will be created in you
 | `tracking_start_time`    | DateTime       | `@tracking_start_time` | Date and time when tracking started  |
 | `tracking_end_time`      | DateTime       | `@tracking_end_time`   | Date and time when tracking ended    |
 | `total_distance`         | Real           | `$length`              | Tracked distance |
-| `tracked_by`             | String         | `@mergin_username`     | Name of the current <MainPlatformNameLink /> user |
+| `tracked_by`             | String         | `@mm_username`     | Name of the current <MainPlatformNameLink /> user |
 
 You can add new fields as needed, however, they should be set up with automatically generated [default values](../../layer/form-configuration/#default-values) as <MobileAppName /> will not open the form for manual inputs. You may use some of the QGIS functions, [extra position variables](../../layer/position_variables/) or [extra QGIS variables](../../layer/plugin-variables/).
 

src/gis/photo-names/index.md

@@ -18,7 +18,7 @@ To set up custom photo names:
 3. In the **Expression Dialog** window, enter the expression that should be used as the photo's name. Please, keep in mind [basic recommendations](#best-practice-for-photo-name-expressions) to make sure the naming works as intended.
 
    Here we use a combination of the layer's name, <MainPlatformName /> username and current timestamp (other examples ale listed [below](#examples-of-photo-names-expressions)): 
-   ` @layer_name + '-' +  @mergin_username + '-' + format_date(now(),'yyMMddhhmmss')`
+   ` @layer_name + '-' +  @mm_username + '-' + format_date(now(),'yyMMddhhmmss')`
 
    Example result is displayed in the **Preview**: `hedges-sarah-230707194052`
 
@@ -38,7 +38,7 @@ There are some tips to keep in mind when creating the expression for your photo
 
 :white_check_mark: **Each photo needs to have a unique name** to avoid issues during synchronisation and ensure that photos and features are linked correctly.
 
-Therefore, we recommend using combinations of variables that will ensure that there would not be multiple photos with the same name, such as the current date and time `now()`, <MainPlatformName /> username `@mergin_username`, layer name `@layer_name` or a field value.
+Therefore, we recommend using combinations of variables that will ensure that there would not be multiple photos with the same name, such as the current date and time `now()`, <MainPlatformName /> username `@mm_username`, layer name `@layer_name` or a field value.
 
 :white_check_mark: The file extension (`.jpg`) is added automatically.
 
@@ -55,7 +55,7 @@ In general, it is useful to use some of these variables:
 
   It can be variously reformatted using the `format_date()` function. See <QGISHelp ver="latest" link="/user_manual/expressions/functions_list.html#format-date" text="See QGIS User manual" /> for more details.
 
-- When working in a team, consider using <MainPlatformName /> username `@mergin_username`.
+- When working in a team, consider using <MainPlatformName /> username `@mm_username`.
 
   Even if multiple team members capture a photo at the same time, the name will be different. Also, it makes it easy to sort photos based on who took them. 
 
@@ -67,7 +67,7 @@ In general, it is useful to use some of these variables:
 ### Examples of photo names expressions
 Here are some example expressions that can be used or modified to fit your needs:
 
-- Expression: ` @layer_name + '-' +  @mergin_username + '-' + format_date(now(),'yyMMddhhmmss')`
+- Expression: ` @layer_name + '-' +  @mm_username + '-' + format_date(now(),'yyMMddhhmmss')`
    - Preview: `hedges-sarah-230707154052.jpg`
    - Description: This is a combination of the name of a layer (`hedges`), <MainPlatformName /> username (`sarah`) and reformatted timestamp that starts with the year and ends with seconds.
 

src/layer/form-configuration/index.md

@@ -31,14 +31,14 @@ Various usage of default values can be explored in more detail by downloading or
 Let's set up an attributes to record the <MainPlatformName /> username of the surveyor who *created* a feature:
 1. Right-click on a layer, select **Properties** and go to the **Attributes form** tab.
 2. In the list of **Available Widgets** select the text field you want to use (here: `inserted_by`)
-3. In the **Defaults** tab, define the **Default value** as `@mergin_username`. 
+3. In the **Defaults** tab, define the **Default value** as `@mm_username`. 
    Do not check the **Apply default value on update** option :white_large_square:.
 
 ![QGIS attributes form Mergin Maps username default value](./qgis-form-default-inserted-by.jpg "QGIS attributes form Mergin Maps username default value")
 
 To save the <MainPlatformName /> username of the surveyor who *modified* this feature, the steps are similar:
 1. In the list of **Available Widgets** select the text field you want to use (here: `updated_by`)
-2. In the **Defaults** tab, define the **Default value** as `@mergin_username`. 
+2. In the **Defaults** tab, define the **Default value** as `@mm_username`. 
    Check the **Apply default value on update** option :heavy_check_mark:. The field will be updated anytime the feature is modified, saving the name of the surveyor who made the changes.
 
 ![QGIS attributes form Mergin Maps username default value](./qgis-form-default-updated-by.jpg "QGIS attributes form Mergin Maps username default value")
@@ -81,7 +81,7 @@ There are some commonly used default values that can be useful in your field sur
 
 - It is convenient to know when a feature was created and when it was last updated. Use fields with **Date** or **Date&Time** data types with the `now()` function to record this information. You can change the formatting using the [Date/Time](../form-widgets/#date-and-time) widget.
 
-- The name of the <MainPlatformName /> user who created or modified the feature can be recorded using the `@mergin_username` variable. These fields should use **Text (string)** data type. 
+- The name of the <MainPlatformName /> user who created or modified the feature can be recorded using the `@mm_username` variable. These fields should use **Text (string)** data type. 
   There are also other [extra QGIS variables](../position_variables/) related to your <MainPlatformName /> account or service that can be used as default values.
 
 - The coordinates of a point feature can be recorded as well using the `$x` and `$y` function in QGIS. To record the coordinate accurately, these fields should have the **Decimal number (real)** data type.  If the coordinates are in metres, values can be rounded to, say, 2-3 decimal places. When working with geographic coordinates that use degrees, you may want to round the coordinates to 8 decimal places. Use the *apply default value on update* option so that you have correct values when the position of the point feature changes.
@@ -96,8 +96,8 @@ Here are some examples:
 |-----------------------------|-------------------------------|---------|-------------|
 | `@now`          | `2024-06-30 10:00:00`                      | **no**  | The timestamp of when the feature was created. |
 | `@now`          | `2024-06-30 10:30:00`                     | **yes**  | The timestamp of when the feature was last **updated**. |
-| `@mergin_username`          | `sarah`                      | **no**  | Name of the user who created this feature.|
-| `@mergin_username`          | `jack`                      | **yes**  | Name of the user who **updated** this feature last.|
+| `@mm_username`          | `sarah`                      | **no**  | Name of the user who created this feature.|
+| `@mm_username`          | `jack`                      | **yes**  | Name of the user who **updated** this feature last.|
 | `round($x,2)`          | `1898789.92`                      | **yes**  | The X coordinate of a point feature, rounded to 2 decimal places.|
 | `$length`          | `123.45`                      | **yes**  | The length of a line feature.|
 | `$area`          | `1234.56`                      | **yes**  | The area of a polygon feature.|