fix(specs): API key description will be obfuscated (#3840)

Author: kai687

specs/search/paths/keys/key.yml

@@ -7,7 +7,8 @@ get:
     Gets the permissions and restrictions of an API key.
 
     When authenticating with the admin API key, you can request information for any of your application's keys.
-    When authenticating with other API keys, you can only retrieve information for that key.
+    When authenticating with other API keys, you can only retrieve information for that key,
+    with the description replaced by `<redacted>`.
   parameters:
     - $ref: 'common/parameters.yml#/KeyString'
   responses: