docs: standardize region tagging pt.2 (GoogleCloudPlatform#1256)

This finishes up the work from PR GoogleCloudPlatform#1247. New tags have proliferated on DevSite, and these old ones are no longer needed.

Author: Anthony

asset/src/search_all_iam_policies.php

@@ -27,7 +27,6 @@
 $pageToken = isset($argv[4]) ? $argv[4] : '';
 
 // [START asset_quickstart_search_all_iam_policies]
-// [START asset_search_all_iam_policies]
 use Google\Cloud\Asset\V1\AssetServiceClient;
 
 /** Uncomment and populate these variables in your code */
@@ -50,5 +49,4 @@
 foreach ($response->getPage() as $policy) {
     print($policy->getResource() . PHP_EOL);
 }
-// [END asset_search_all_iam_policies]
 // [END asset_quickstart_search_all_iam_policies]

asset/src/search_all_resources.php

@@ -29,7 +29,6 @@
 $orderBy = isset($argv[6]) ? $argv[6] : '';
 
 // [START asset_quickstart_search_all_resources]
-// [START asset_search_all_resources]
 use Google\Cloud\Asset\V1\AssetServiceClient;
 
 /** Uncomment and populate these variables in your code */
@@ -56,5 +55,4 @@
 foreach ($response->getPage() as $resource) {
     print($resource->getName() . PHP_EOL);
 }
-// [END asset_search_all_resources]
 // [END asset_quickstart_search_all_resources]