docs/for-each-ref: update pointer to color syntax
The documentation for the %(color) placeholder refers to the color.branch.* config for more details. But those details moved to their own section in b92c1a28 (Documentation/config.txt: describe 'color' value type in the "Values" section, 2015-03-03). Let's update our pointer. We can steal the text from 30cfe72d (pretty: fix document link for color specification, 2016-10-11), which fixed the same problem in a different place. While we're at it, let's give an example, which makes the syntax much more clear than just the text. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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