docs: fix filter-branch subdir example for exotic repo names
The GIT_INDEX_FILE variable we get from git has the full path to the repo, which may contain spaces. When we use it in our shell snippet, it needs to be quoted. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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