[PATCH] escape tilde in Documentation/git-rev-parse.txt

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

fixes a failure to build the git-rev-parse manpage,
seen with asciidoc 8.0.0

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
---
diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index b761b4b..671b4e3 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -138,7 +138,7 @@ syntax.
   'rev{caret}0' means the commit itself and is used when 'rev' is the
   object name of a tag object that refers to a commit object.
 
-* A suffix '~<n>' to a revision parameter means the commit
+* A suffix '$$~$$<n>' to a revision parameter means the commit
   object that is the <n>th generation grand-parent of the named
   commit object, following only the first parent.  I.e. rev~3 is
   equivalent to rev{caret}{caret}{caret} which is equivalent to\