[PATCH] filter-branch documentation: clarify which filters are eval'ed

All filters, except the commit filter, are evaluated.

Signed-off-by: Johannes Schindelin <redacted>
---

	I tried to extract the magic of the "remove commit" example into a 
	function "skip_commit", since I guess it will be a common 
	operation. Alas, since the commit filter has to be "sh -c"ed to 
	get arguments, I do not see any way to use a convenience function 
	in there, short of sourcing a helper file. Does anybody see a 
	better way?

 Documentation/git-filter-branch.txt |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index 219a81d..eaea82d 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt

@@ -50,7 +50,8 @@ Filters
 ~~~~~~~
 
 The filters are applied in the order as listed below.  The <command>
-argument is always evaluated in shell using the 'eval' command.
+argument is always evaluated in shell using the 'eval' command (with the
+notable exception of the commit filter, for technical reasons).
 Prior to that, the $GIT_COMMIT environment variable will be set to contain
 the id of the commit being rewritten.  Also, GIT_AUTHOR_NAME,
 GIT_AUTHOR_EMAIL, GIT_AUTHOR_DATE, GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL,

-- 
1.5.3.rc0.2689.g99ca2-dirty