docs: improve descriptions for filters

Author: kenjis

docs/quick_start_guide/using_session_auth.md

@@ -94,7 +94,13 @@ command.
 
 ## Protecting Pages
 
-If you want to limit all routes (e.g. `localhost:8080/admin`, `localhost:8080/panel` and ...), you need to add the following code in the **app/Config/Filters.php** file.
+By default, Shield does not protect pages. To make certain pages accessible only
+to logged-in users, set the `session`
+[controller filter](../references/controller_filters.md).
+
+For example, if you want to limit all routes (e.g. `localhost:8080/admin`,
+`localhost:8080/panel` and ...), you need to add the following code in the
+**app/Config/Filters.php** file.
 
 ```php
 public $globals = [

docs/references/controller_filters.md

@@ -27,11 +27,11 @@ $aliases = [
 
 | Filters     | Description                                                                                                                                                                                                                         |
 |-------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| session     | The `Session` authenticator.                                                                                                                                                                                                        |
-| tokens      | The `AccessTokens` authenticator.                                                                                                                                                                                                   |
+| session     | Restricts access to users who are not authenticated by the `Session` authenticator.                                                                                                                                                 |
+| tokens      | Restricts access to users who are not authenticated by the `AccessTokens` authenticator.                                                                                                                                            |
 | chained     | The filter will check authenticators in sequence to see if the user is logged in through either of authenticators, allowing a single API endpoint to work for both an SPA using session auth, and a mobile app using access tokens. |
-| jwt         | The `JWT` authenticator. See [JWT Authentication](../addons/jwt.md).                                                                                                                                                                |
-| hmac        | The `HMAC` authenticator. See [HMAC Authentication](../guides/api_hmac_keys.md).                                                                                                                                                    |
+| jwt         | Restricts access to users who are not authenticated by the `JWT` authenticator. See [JWT Authentication](../addons/jwt.md).                                                                                                         |
+| hmac        | Restricts access to users who are not authenticated by the `HMAC` authenticator. See [HMAC Authentication](../guides/api_hmac_keys.md).                                                                                                                    |
 | auth-rates  | Provides a good basis for rate limiting of auth-related routes.                                                                                                                                                                     |
 | group       | Checks if the user is in one of the groups passed in.                                                                                                                                                                               |
 | permission  | Checks if the user has the passed permissions.                                                                                                                                                                                      |