docs: use :php:func:

Author: kenjis

user_guide_src/source/tutorial/news_section.rst

@@ -144,10 +144,10 @@ and add the next piece of code.
 
 .. literalinclude:: news_section/005.php
 
-.. note:: We are again using using ``esc()`` to help prevent XSS attacks.
+.. note:: We are again using using :php:func:`esc()` to help prevent XSS attacks.
     But this time we also passed "url" as a second parameter. That's because
     attack patterns are different depending on the context in which the output
-    is used. You can read more about it :doc:`here </general/common_functions>`.
+    is used.
 
 Here, each news item is looped and displayed to the user. You can see we
 wrote our template in PHP mixed with HTML. If you prefer to use a template