Merge pull request #1561 from ixth/patch-1

Escape tilde to fix HEAD~~~ presented as HEAD~

Author: ben

book/07-git-tools/sections/revision-selection.asc

@@ -282,7 +282,7 @@ Date:   Fri Nov 7 13:47:59 2008 -0500
     Ignore *.gem
 ----
 
-This can also be written `HEAD~~~`, which again is the first parent of the first parent of the first parent:
+This can also be written `HEAD\~~~`, which again is the first parent of the first parent of the first parent:
 
 [source,console]
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