- (glossary) the quotes around the Wikipedia URL prevented its
  linkification in frontends that support it; remove them

- (manual) newer version (SHA-1) == following, older == preceding, not
  the other way around

- trivial typo and wording fixes
Signed-off-by: NŠtěpán Němec <stepnem@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>