docs: fix punctuation

Author: sajadtorkamani

guides/source/working_with_javascript_in_rails.md

@@ -320,8 +320,8 @@ added to the form that the `button_to` helper renders internally:
 
 ### Ajax Requests
 
-When making non-GET requests from JavaScript the `X-CSRF-Token` header is required.
-Without this header requests won't be accepted by Rails.
+When making non-GET requests from JavaScript, the `X-CSRF-Token` header is required.
+Without this header, requests won't be accepted by Rails.
 
 NOTE: This token is required by Rails to prevent Cross-Site Request Forgery (CSRF) attacks. Read more in the [security guide](security.html#cross-site-request-forgery-csrf).