Merge pull request #15392 from willyross/update-env-comments

Updated comments in `.env.example`

Author: corwintines

.env.example

@@ -4,6 +4,11 @@
 # be careful not to expose sensitive data (e.g. your Algolia admin key)
 
 # Algolia environment (app ID, search key and base search index name required for search)
+# You can use the following test keys provided by DocSearch for local development/testing:
+# NEXT_PUBLIC_ALGOLIA_APP_ID=R2IYF7ETH7
+# NEXT_PUBLIC_ALGOLIA_SEARCH_KEY=599cec31baffa4868cae4e79f180729b
+# NEXT_PUBLIC_ALGOLIA_BASE_SEARCH_INDEX_NAME=docsearch
+# Replace insertValue with your actual keys for production builds.
 # NEXT_PUBLIC_ALGOLIA_APP_ID=insertValue
 # NEXT_PUBLIC_ALGOLIA_SEARCH_KEY=insertValue
 # NEXT_PUBLIC_ALGOLIA_BASE_SEARCH_INDEX_NAME=insertValue