Correct verbiage in reference to other section (#11320)

Author: paulstatezny

lib/elixir/pages/patterns-and-guards.md

@@ -287,7 +287,7 @@ You can find the built-in list of guards [in the `Kernel` module](Kernel.html#gu
 
 The module `Bitwise` also includes a handful of [Erlang bitwise operations as guards](Bitwise.html#guards).
 
-Macros constructed out of any combination of the above guards are also valid guards - for example, `Integer.is_even/1`. For more information, see the "Defining custom guard expressions" section shown below.
+Macros constructed out of any combination of the above guards are also valid guards - for example, `Integer.is_even/1`. For more information, see the "Custom patterns and guards expressions" section shown below.
 
 ### Why guards