Update articles/frontdoor/front-door-caching.md

Author: Jak-MS

articles/frontdoor/front-door-caching.md

@@ -173,7 +173,7 @@ The following request headers won't be forwarded to a backend when using caching
 
 ## Response headers
 
-The following response headers will be stripped if the origin response is cacheable e.g. Cache control header has max-age value.
+The following response headers will be stripped if the origin response is cacheable. For example, Cache control header has max-age value.
 
 - Set-Cookie