git-fetch.txt: improve description of tag auto-following

Make it clearer that tags are fetched independent of which branches
were fetched from the remote in any particular fetch.  (Tags are even
fetched if they point at objects that are in the current repository
but not reachable, which is probably a bug.)

Put less emphasis on the mechanism and more on the effect of tag
auto-following.  Also mention the options and configuration settings
that can change the tag-fetching behavior.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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