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
diff --git a/Documentation/cmd-review.txt b/Documentation/cmd-review.txt
index a37efb0..510edce 100644
--- a/Documentation/cmd-review.txt
+++ b/Documentation/cmd-review.txt
@@ -1,12 +1,10 @@
 gerrit review
 ==============
 
-NAME
-----
+== NAME
 gerrit review - Verify, approve and/or submit one or more patch sets
 
-SYNOPSIS
---------
+== SYNOPSIS
 --
 'ssh' -p <port> <host> 'gerrit review'
   [--project <PROJECT> | -p <PROJECT>]
@@ -22,8 +20,7 @@
   {COMMIT | CHANGEID,PATCHSET}...
 --
 
-DESCRIPTION
------------
+== DESCRIPTION
 Updates the current user's approval status of the specified patch
 sets and/or submits them for merging, sending out email
 notifications and updating the database.
@@ -40,8 +37,7 @@
 branch.
 
 
-OPTIONS
--------
+== OPTIONS
 
 --project::
 -p::
@@ -113,16 +109,13 @@
 	or invalid value) and votes that are not permitted for the user are
 	silently ignored.
 
-ACCESS
-------
+== ACCESS
 Any user who has configured an SSH key.
 
-SCRIPTING
----------
+== SCRIPTING
 This command is intended to be used in scripts.
 
-EXAMPLES
---------
+== EXAMPLES
 
 Approve the change with commit c0ff33 as "Verified +1"
 =====
@@ -157,8 +150,7 @@
   $ ssh -p 29418 review.example.com gerrit review --abandon c0ff33
 ====
 
-SEE ALSO
---------
+== SEE ALSO
 
 * link:access-control.html[Access Controls]