Bzr Updating Instructions

[Max Kanat-Alexander]

	In preparation for the coming 3.7.1 release (which will ship with .bzr 
instead of CVS directories), I've updated the Bugzilla:Bzr web page with 
instructions on how to update an existing checkout:

	https://wiki.mozilla.org/Bugzilla:Bzr#Updating_to_a_Newer_Release

	-Max
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