Add missing API docs on external user

[ci skip]

doc/api/users.md

@@ -220,6 +220,7 @@ Parameters:
 - `bio`                         - User's biography
 - `admin` (optional)            - User is admin - true or false (default)
 - `can_create_group` (optional) - User can create groups - true or false
+- `external` (optional)         - Flags the user as external - true or false(default)
 
 Note, at the moment this method does only return a 404 error,
 even in cases where a 409 (Conflict) would be more appropriate,

lib/api/users.rb

@@ -61,7 +61,7 @@ module API
       #   admin                             - User is admin - true or false (default)
       #   can_create_group                  - User can create groups - true or false
       #   confirm                           - Require user confirmation - true (default) or false
-      #   external                          - Is user an external user - true or false(default)
+      #   external                          - Flags the user as external - true or false(default)
       # Example Request:
       #   POST /users
       post do
@@ -108,7 +108,7 @@ module API
       #   bio                               - Bio
       #   admin                             - User is admin - true or false (default)
       #   can_create_group                  - User can create groups - true or false
-      #   external                          - Is user an external user - true or false(default)
+      #   external                          - Flags the user as external - true or false(default)
       # Example Request:
       #   PUT /users/:id
       put ":id" do