fix some docs

docs/intro.md

@@ -53,4 +53,4 @@ python main.py
 
 Open your broswer and visite [http://localhost:8888](http://localhost:8888)
 
-Server default start on port 8888, you can change this `python main.py --port=8890`
+Server start on port 8888 default, you can change this `python main.py --port=8890`

docs/tutorial/app.md

@@ -1,6 +1,6 @@
 #### What is app-server
 
-App-server is web application, be made fo one or more sub app, each sub app easily migrited and resue
+App-server is web application, be made of one or more sub app, each sub app easily migrited and resue
 
 
 `app-server` directory skeleton
@@ -18,7 +18,7 @@ App-server is web application, be made fo one or more sub app, each sub app easi
     │       ├── base.py
     │       ├── __init__.py
     │       ├── setting.py
-    ├── main.py                        # entry port
+    ├── main.py                        # entry
     ├── setting.py                     
     ├── templates                      
     │   └── user

docs/tutorial/helper.md

@@ -8,25 +8,30 @@ Helper is business lagic layer.
 ```
 
 helpers/
-   ├── wallpaper             # mongodb databse instance mappig, one instance helper
+   ├── wallpaper             # each package in helpers represents one mongodb databse instance
    │   ├── album.py          
    │   ├── category.py
    │   ├── image.py
    │   ├── img2tag.py
    │   ├── __init__.py       
    │   └── tag.py
    ├── __init__.py           
-   ├── settings.py           
+   ├── settings.py           # here is package needed to be installed automatically
    
 ```
 
 #### Create helper
 
-In helpers package, create package that `__init__.py` with `__all__` list attribute explicitly.
+Add '__all__' list attribute explicitly into helper package `wallpaper`   `__init__.py` file.
+It's job is to include all modules needed to be used.
+
+```python
+__all__ = ['img2tag']
+
+```
 
-Put `module` in `__all__` list
 
-Install helper in helpers/setting.py
+Install helper in `helpers/setting.py`
 
 ```
 

docs/tutorial/index.md

@@ -16,6 +16,6 @@ Turbo application directory tree skeleton is below:
 
 [app-server](app-server) is a web app, not python package. Turbo application can have one or many app-server, each with different name.
 
-[helpers](helpers) is model sechema instance, responsible for business logic.
+[helpers](helpers) is model instance, responsible for business logic.
 
 `db` is support for mongodb connections

docs/tutorial/model.md

@@ -1,6 +1,6 @@
 #### What is `model`
 
-Instances of model represent mongodb collection, model defines the collection schema.
+Instance of model `Class` represents mongodb collection, model defines the collection schema.
 
 
 `models` directory skeleton
@@ -13,21 +13,25 @@ models
 ├── user                   
 │   ├── __init__.py
 │   ├── base.py            
-│   ├── model.py           # all model class, each represents one mongodb collection
+│   ├── model.py           # all model Class, each represents one mongodb collection
 │   └── setting.py         # setting for user model
 
 ```
 
 
 #### Create model
 
-In models package create package like bellow
+In models package create package `user` like bellow
 
 
-* __init__.py
-* base.py
-* setting.py
-* model.py
+```bash
+user
+├──__init__.py
+├── base.py            
+├── model.py           
+└── setting.py  
+
+```
 
 
 Put code in `base.py`
@@ -46,7 +50,7 @@ class Model(BaseModel):
 ```
 
 
-Create Class inherited `turbo.model.BaseModel`
+Create `Class` inherited from `turbo.model.BaseModel`
 
 ```
 from base import *