chore: switch master branch to main (GoogleCloudPlatform#1667)

Author: bshaffer

CONTRIBUTING.md

@@ -18,7 +18,7 @@
 /**
  * For instructions on how to run the full sample:
  *
- * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/appengine/flexible/tasks/README.md
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/appengine/flexible/tasks/README.md
  */
 
 namespace Google\Cloud\Samples\Tasks;

appengine/flexible/tasks/src/create_task.php

@@ -17,7 +17,7 @@
 /**
  * For instructions on how to run the full sample:
  *
- * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/auth/README.md
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/auth/README.md
  */
 
 # [START gae_auth_api_implicit]

appengine/standard/auth/src/auth_api.php

@@ -17,7 +17,7 @@
 /**
  * For instructions on how to run the full sample:
  *
- * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/auth/README.md
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/auth/README.md
  */
 
 # [START gae_auth_cloud_implicit]

appengine/standard/auth/src/auth_cloud.php

@@ -31,7 +31,7 @@ class Handler extends ExceptionHandler
      * Report or log an exception to Google Cloud Stackdriver Error Reporting
      *
      * For a full tutorial on deploying Laravel to Google Cloud,
-     * @see https://github.com/GoogleCloudPlatform/php-docs-samples/blob/master/appengine/standard/laravel-framework/README.md
+     * @see https://github.com/GoogleCloudPlatform/php-docs-samples/blob/main/appengine/standard/laravel-framework/README.md
      *
      * @param  \Exception  $exception
      * @return void

appengine/standard/errorreporting/README.md

@@ -18,7 +18,7 @@
 /**
  * For instructions on how to run the full sample:
  *
- * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/appengine/standard/tasks/README.md
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/appengine/standard/tasks/README.md
  */
 
 // Include Google Cloud dependendencies using Composer

appengine/standard/laravel-framework/app/Exceptions/Handler.php

@@ -3,6 +3,6 @@
         "ext-phar": "*",
         "ext-zip": "*",
         "paragonie/random_compat": "^9.0.0",
-        "google/cloud-tools": "dev-master"
+        "google/cloud-tools": "dev-main"
     }
 }

appengine/standard/tasks/snippets/src/create_task.php

@@ -17,7 +17,7 @@
 /**
  * For instructions on how to run the full sample:
  *
- * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/auth/README.md
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/auth/README.md
  */
 
 # [START auth_api_explicit]

appengine/standard/wordpress/composer.json

@@ -17,7 +17,7 @@
 /**
  * For instructions on how to run the full sample:
  *
- * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/auth/README.md
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/auth/README.md
  */
 
 # [START auth_api_explicit_compute]