Documentation: Grammar correction, wording fixes and cleanup Correct a few grammar issues in gitrepository-layout.txt and also rewords a few sections for clarity. Remove references to using http-fetch without -a to create a broken repository. Mark a few areas of the repository structure as legacy. Signed-off-by: Ben Walton <bwalton@artsci.utoronto.ca> Signed-off-by: Junio C Hamano <gitster@pobox.com>