Documentation: git-init: typographical fixes

Use backticks when we quote something that the user should literally
use.

Signed-off-by: Linus Arver <linusarver@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation: git-init: list items facelift

No textual change.

Signed-off-by: Linus Arver <linusarver@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation: git-init: template directory: reword

Signed-off-by: Linus Arver <linusarver@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation: git-init: --separate-git-dir: clarify

Use shorter sentences to describe what actually happens. We describe
what the term "Git symbolic link" actually means.

Also, we separate out the description of the behavioral change upon
reinitialization into its own paragraph.

Signed-off-by: Linus Arver <linusarver@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation: git-init: reword parenthetical statements

Signed-off-by: Linus Arver <linusarver@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation: git-init: template directory: reword and cross-reference

Signed-off-by: Linus Arver <linusarver@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Documentation: git-init: flesh out example

Add a third step `git commit` after adding files for the first time.

Signed-off-by: Linus Arver <linusarver@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>