The documentation for the %(color) placeholder refers to the
color.branch.* config for more details. But those details
moved to their own section in b92c1a28f
(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 30cfe72d3 (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: Jeff King <p...@peff.net>
---
 Documentation/git-for-each-ref.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-for-each-ref.txt 
b/Documentation/git-for-each-ref.txt
index 03e187a10..cc42c1283 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -156,8 +156,10 @@ HEAD::
        otherwise.
 
 color::
-       Change output color.  Followed by `:<colorname>`, where names
-       are described in `color.branch.*`.
+       Change output color. Followed by `:<colorname>`, where color
+       names are described under Values in the "CONFIGURATION FILE"
+       section of linkgit:git-config[1].  For example,
+       `%(color:bold red)`.
 
 align::
        Left-, middle-, or right-align the content between
-- 
2.13.2.1157.gc6daca446

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