Update user_guide_src/source/libraries/images.rst

Co-authored-by: kenjis <[email protected]>

Author: ddevsr

user_guide_src/source/libraries/images.rst

@@ -27,7 +27,7 @@ in your controller by calling the global function service:
 .. literalinclude:: images/001.php
 
 You can pass the alias for the image library you wish to use into the global
-function service:
+function ``service()``:
 
 .. literalinclude:: images/002.php