Make descriptions consistent>

Signed-off-by: Archer <naarcha@amazon.com>

spec/namespaces/security.yaml

@@ -147,7 +147,7 @@ paths:
       x-distributions-excluded:
         - amazon-managed
         - amazon-serverless
-      description: Gets the identity information for the user currently logged in. To use this operation, you must have access to this endpoint when authorization at REST layer is enabled.
+      description: Gets the identity information for the user currently logged in. 
       responses:
         '200':
           $ref: '#/components/responses/security.who_am_i@200'