docs: add section title and link to function

Author: kenjis

user_guide_src/source/general/logging.rst

@@ -6,7 +6,10 @@ Logging Information
     :local:
     :depth: 2
 
-You can log information to the local log files by using the ``log_message()`` method. You must supply
+Log Levels
+==========
+
+You can log information to the local log files by using the :php:func:`log_message()` method. You must supply
 the "level" of the error in the first parameter, indicating what type of message it is (debug, error, etc).
 The second parameter is the message itself:
 
@@ -32,6 +35,8 @@ The logging system does not provide ways to alert sysadmins or webmasters about
 the information. For many of the more critical event levels, the logging happens automatically by the
 Error Handler, described above.
 
+.. _logging-configuration:
+
 Configuration
 =============