[PATCH 1/2] commit doc: document that -c, -C, -F and --fixup with -m error

Document that providing any of -c, -C, -F and --fixup along with -m
will result in an error. Some variant of this has been errored about
explicitly since 0c091296c0 ("git-commit: log parameter updates.",
2005-08-08), but the documentation was never updated to reflect this.

Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
---
 Documentation/git-commit.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/git-commit.txt b/Documentation/git-commit.txt
index 8c74a2ca03..df83176314 100644
--- a/Documentation/git-commit.txt
+++ b/Documentation/git-commit.txt

@@ -144,6 +144,9 @@ OPTIONS
 	Use the given <msg> as the commit message.
 	If multiple `-m` options are given, their values are
 	concatenated as separate paragraphs.
++
+Combining the `-m` option and any of `-c`, `-C`, `-F` or `--fixup`
+will result in an error.
 
 -t <file>::
 --template=<file>::

-- 
2.15.1.424.g9478a66081