/usr/share/joe/syntax/git-commit.jsf is in joe 4.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | # JOE syntax highlight file for Markdown
# by Christian Nicolai (http://mycrobase.de)
=Idle
=Ignore +Comment
:line_start Idle
* idle noeat
"#" ignore recolor=-1
:idle Idle
* idle
"\n" line_start
:ignore Ignore
* ignore
"\n" line_start
|