credential: update gitcredentials documentation

Clarify the expected effect of all attributes and how the helpers
are expected to handle them and the context where they operate.

While at it, space the descriptions for clarity, and add a paragraph
mentioning the early termination in the list processing of helpers,
to complement the one about the special "quit" attribute.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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