[PATCH v3 8/9] doc: trailer: mention 'key' in DESCRIPTION

["Linus Arver via GitGitGadget" <gitgitgadget@gmail.com>]

From: Linus Arver <linusa@google.com>

The 'key' option is used frequently in the examples at the bottom but
there is no mention of it in the description.

Signed-off-by: Linus Arver <linusa@google.com>
---
 Documentation/git-interpret-trailers.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-interpret-trailers.txt b/Documentation/git-interpret-trailers.txt
index b034784e1d8..2e92640543c 100644
--- a/Documentation/git-interpret-trailers.txt
+++ b/Documentation/git-interpret-trailers.txt
@@ -48,7 +48,9 @@ token: value
 ------------------------------------------------
 
 This means that the trimmed <token> and <value> will be separated by
-`': '` (one colon followed by one space).
+`': '` (one colon followed by one space). If the <token> should have a different
+string representation than itself, then the 'key' can be configured with
+'trailer.<token>.key'.
 
 By default the new trailer will appear at the end of all the existing
 trailers. If there is no existing trailer, the new trailer will appear
-- 
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