Fix registry key syntax in FAQ.

doc/faq.rst

@@ -11,7 +11,7 @@ It is possible that another program is changing the modification date of the fil
 
 If the file is uses the ``.eml`` extension, Windows automatically and
 continually changes all files, unless you remove
-``\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PropertySystem\PropertyHandlers`
+``\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PropertySystem\PropertyHandlers``
 from the windows registry.
 
 See http://petersteier.wordpress.com/2011/10/22/windows-indexer-changes-modification-dates-of-eml-files/ for more information.