bottle: fix regex

Noted that this is intended for the revision of this formula instead of
rebuild of a bottle.

Library/Homebrew/dev-cmd/bottle.rb

@@ -443,7 +443,7 @@ module Homebrew
                       (\n^\ {3}[\S\ ]+$)*                                        # options can be in multiple lines
                     )?|
                     (homepage|desc|sha1|sha256|version|mirror)\ ['"][\S\ ]+['"]| # specs with a string
-                    rebuild\ \d+                                                 # rebuild with a number
+                    revision\ \d+                                                # revision with a number
                   )\n+                                                           # multiple empty lines
                  )+
                /mx, '\0' + output + "\n"