Use the new section title style in Asciidoctor.

We previous use the section title style like:

Section level 1
===============

Section level 2
---------------

Which have a problem in Asciidoctor that the number of "="s or "-"s must match
the number of characters in the header exactly, as a result it's easy to make
mistakes while changing the titles. Asciidoctor provides a better style like:

= Section level 1

== Section level 2

So we switched to this style.

Also fixed a bug in replace_macros.py, which will not cause any problem in the
old style.

Change-Id: I811dd7238735d98f662767c17086152cd69aea02

Documentation/cmd-plugin-reload.txt

diff --git a/Documentation/cmd-plugin-reload.txt b/Documentation/cmd-plugin-reload.txt
index ecf1ff4..8889307 100644
--- a/Documentation/cmd-plugin-reload.txt
+++ b/Documentation/cmd-plugin-reload.txt
@@ -1,19 +1,15 @@
-plugin reload
-=============
+= plugin reload
 
-NAME
-----
+== NAME
 plugin reload - Reload/Restart plugins.
 
-SYNOPSIS
---------
+== SYNOPSIS
 --
 'ssh' -p <port> <host> 'gerrit plugin reload'
   <NAME> ...
 --
 
-DESCRIPTION
------------
+== DESCRIPTION
 Reload/Restart plugins.
 
 Whether a plugin is reloaded or restarted is defined by the plugin's
@@ -22,22 +18,18 @@
 E.g. a plugin needs to be reloaded if its configuration is modified to
 make the new configuration data become active.
 
-ACCESS
-------
+== ACCESS
 Caller must be a member of the privileged 'Administrators' group.
 
-SCRIPTING
----------
+== SCRIPTING
 This command is intended to be used in scripts.
 
-OPTIONS
--------
+== OPTIONS
 <NAME>::
 	Name of the plugin that should be reloaded.  Multiple names of
 	plugins that should be reloaded may be specified.
 
-EXAMPLES
---------
+== EXAMPLES
 Reload a plugin:
 
 ====