[PATCH 2/3] diff-format.adoc: 'git diff-files' prints two lines for unmerged files

["Philippe Blain via GitGitGadget" <gitgitgadget@gmail.com>]

From: Philippe Blain <levraiphilippeblain@gmail.com>

Since 10637b84d9 (diff-files: -1/-2/-3 to diff against unmerged stage.,
2005-11-29), for unmerged entries 'git diff-files' print both an
"unmerged" line ('U'), as well as an "in-place edit" line ('M')
comparing stage 2 (by default) with the working tree. The "Raw output
format" documentation however mentions that all commands print a single
line per changed file. Adjust diff-format.adoc to also mention this
special case, for completeness.

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
---
 Documentation/diff-format.adoc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/diff-format.adoc b/Documentation/diff-format.adoc
index 7f18c64f1e..43d91ef868 100644
--- a/Documentation/diff-format.adoc
+++ b/Documentation/diff-format.adoc
@@ -19,7 +19,9 @@ compared differs:
 `git-diff-files [<pattern>...]`::
         compares the index and the files on the filesystem.
 
-All the commands print one output line per changed file.
+All the commands print one output line per changed file,
+except `git diff-files` in the case of an unmerged file, which prints
+both an "unmerged" and an "in-place edit" line.
 
 An output line is formatted this way:
 
-- 
gitgitgadget