Fixes some references to Drupal 8 (#633)

Co-authored-by: Raakesh Blokhra <[email protected]>

Author: earth2marsh

README.md

@@ -1,6 +1,6 @@
 # Apigee Edge Drupal module
 
-The Apigee Edge module enables you to integrate Drupal 9 or Drupal 8 with Apigee:
+The Apigee Edge module enables you to integrate Drupal 9 with Apigee. 
 
 * Users that register or are added to the Drupal site will be added as developers in Apigee.
 * Click on "Apps" in user menu to get keys for the APIs exposed in Apigee.
@@ -10,7 +10,7 @@ This module includes the following submodules:
 * __Debug:__ enables administrators to configure and manage Apigee debug logs.
 * __Teams:__ enables developers to be organized into teams.
 
-For more details read the [Apigee Edge module documentation](https://www.drupal.org/docs/8/modules/apigee-edge).
+For more details read the [Apigee Edge module documentation](https://www.drupal.org/docs/contributed-modules/apigee-edge).
 
 ## Support for Apigee Hybrid Cloud: Beta Release
 
@@ -20,8 +20,8 @@ Please note that Team APIs and Monetization APIs are not currently supported on
 
 ## Requirements
 
-* The Apigee Edge module requires **Drupal 8.7.x** or higher and PHP 7.1 or higher.
-* Drupal 8's minimum requirement is phpdocumentor/reflection-docblock:2.0.4 but at least 3.0 is required by this module. If you get the error  "Your requirements could not be resolved to an installable set of packages" it may be because you are running reflection-docblock version 2. You can update `phpdocumentor/reflection-docblock` with the following command: `composer update phpdocumentor/reflection-docblock --with-dependencies`.
+* The Apigee Edge module requires **Drupal 8.7.x** or higher and PHP 7.1 or higher, though Drupal 9.x is recommended due to [Drupal 8's EOL timeline](https://www.drupal.org/psa-2021-2021-06-29).
+* Drupal's minimum requirement is phpdocumentor/reflection-docblock:2.0.4 but at least 3.0 is required by this module. If you get the error  "Your requirements could not be resolved to an installable set of packages" it may be because you are running reflection-docblock version 2. You can update `phpdocumentor/reflection-docblock` with the following command: `composer update phpdocumentor/reflection-docblock --with-dependencies`.
 * **Check [composer.json](https://github.com/apigee/apigee-edge-drupal/blob/8.x-1.x/composer.json) for any required patches.** Patches prefixed with "(For testing)" are only required for running tests. Those are not necessary for using this module. Patches can be applied with the [cweagans/composer-patches](https://packagist.org/packages/cweagans/composer-patches) plugin automatically or manually. See [Applying Patches](#applying-patches) section below.
 * (For developers) The locked commit from `behat/mink` library is required otherwise tests may fail. This caused by a Drupal core [bug](https://www.drupal.org/project/drupal/issues/2956279). See the related pull request for behat/mink [here](https://github.com/minkphp/Mink/pull/760).
 
@@ -40,15 +40,15 @@ Please note that Team APIs and Monetization APIs are not currently supported on
 2. Click **Extend** in the Drupal administration menu.
 3. Select the **Apigee Edge** module.
 4. Click **Install**.
-5. Configure the [connection to your Apigee org](https://www.drupal.org/docs/8/modules/apigee-edge/configure-the-connection-to-apigee-edge)
+5. Configure the [connection to your Apigee org](https://www.drupal.org/docs/contributed-modules/apigee-edge/configure-the-connection-to-apigee)
 
 ## Notes
 
 * If you do not configure the connection between Drupal and Apigee, you will not be able to register developers on
   the site and may cause other issues with Drupal core functions. If you do not plan to configure the connection between
   Drupal and Apigee, you should uninstall the Apigee Edge module.
 * When you first install the module, existing users in the Drupal site may not have a developer account in Apigee.
-  You can run [developer synchronization](https://www.drupal.org/docs/8/modules/apigee-edge/synchronize-developers-with-apigee-edge)
+  You can run [developer synchronization](https://www.drupal.org/docs/contributed-modules/apigee-edge/synchronize-developers-with-apigee-edge)
   to make sure Drupal users and Apigee developers are synchronized.
 
 ## Applying Patches
@@ -80,4 +80,4 @@ Development is coordinated in our [GitHub repository](https://github.com/apigee/
 
 ## Support
 
-This project, which integrates Drupal 9 & 8 with Apigee, is supported by Google.
+This project, which integrates Drupal with Apigee, is supported by Google.