Replacing docs-beta links with /docs (#957)

Signed-off-by: Vacha Shah <vachshah@amazon.com>

README.md

@@ -14,7 +14,7 @@
 
 * [Project Website](https://opensearch.org/)
 * [Downloads](https://opensearch.org/downloads.html).
-* [Documentation](https://docs-beta.opensearch.org/)
+* [Documentation](https://opensearch.org/docs/)
 * Need help? Try [Forums](https://discuss.opendistrocommunity.dev/)
 * [Project Principles](https://opensearch.org/#principles)
 * [Contributing to OpenSearch](CONTRIBUTING.md)

plugins/examples/rest-handler/src/yamlRestTest/resources/rest-api-spec/api/cat.example.json

@@ -1,7 +1,7 @@
 {
   "cat.example": {
     "documentation": {
-      "url": "https://docs-beta.opensearch.org/opensearch/install/plugins/",
+      "url": "https://opensearch.org/docs/opensearch/install/plugins/",
       "description": "Example"
     },
     "stability" : "stable",