Add comment to tools/git-external-diff.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/dae1e5546cdff98d85215a461f108f71fd254441

Modified Files
--------------
src/tools/git-external-diff |    4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

pgsql-committers by date

Next:	From: Bruce Momjian	Date: 2011-03-11 10:34:43
	Subject: pgsql: Document that the parenthesized VACUUM syntax is deprecated,not
Previous:	From: Bruce Momjian	Date: 2011-03-11 10:03:29
	Subject: pgsql: Change "TIP" to "HINT" to match backend message style,in pg_ctl