docs(admin-api) add name or id in supported routes

targets: delete by id
api specific plugins: delete/patch by plugin name

From #407

app/docs/0.10.x/admin-api.md

@@ -938,12 +938,12 @@ HTTP 200 OK
 
 #### Endpoint
 
-<div class="endpoint patch">/apis/{api name or id}/plugins/{id}</div>
+<div class="endpoint patch">/apis/{api name or id}/plugins/{plugin name or id}</div>
 
 Attributes | Description
 ---:| ---
 `api name or id`<br>**required** | The unique identifier **or** the name of the API for which to update the plugin configuration
-`id`<br>**required** | The unique identifier of the plugin configuration to update on this API
+`plugin name or id`<br>**required** | The unique identifier **or** the name of the plugin configuration to update on this API
 
 #### Request Body
 
@@ -1002,12 +1002,12 @@ See POST and PATCH responses.
 
 #### Endpoint
 
-<div class="endpoint delete">/apis/{api name or id}/plugins/{id}</div>
+<div class="endpoint delete">/apis/{api name or id}/plugins/{plugin name or id}</div>
 
 Attributes | Description
 ---:| ---
 `api name or id`<br>**required** | The unique identifier **or** the name of the API for which to delete the plugin configuration
-`id`<br>**required** | The unique identifier of the plugin configuration to delete on this API
+`plugin name or id`<br>**required** | The unique identifier **or** the name of the plugin configuration to delete on this API
 
 #### Response
 
@@ -1863,12 +1863,12 @@ a new entry for the given target definition with a `weight` of 0.
 
 #### Endpoint
 
-<div class="endpoint delete">/upstreams/{name or id}/targets/{target}</div>
+<div class="endpoint delete">/upstreams/{upstream name or id}/targets/{target or id}</div>
 
 Attributes | Description
 ---:| ---
-`name or id`<br>**required** | The unique identifier **or** the name of the upstream for which to delete the target.
-`target`<br>**required** | The host/port combination element of the target to remove.
+`upstream name or id`<br>**required** | The unique identifier **or** the name of the upstream for which to delete the target.
+`target or id`<br>**required** | The host/port combination element of the target to remove, or the `id` of an existing target entry.
 
 #### Response