The existing text was very vague about what exactly it means
for difference to "contain" a change. This seems to cause
confusion on the mailing list every month or two.
To fix it we:
1. use "introduce or remove an instance of" instead of
"contain"
2. point the user to gitdiffcore(7), which contains a more
complete explanation
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
number.
-S<string>::
- Look for differences that contain the change in <string>.
+ Look for differences that introduce or remove an instance of
+ <string>. Note that this is different than the string simply
+ appearing in diff output; see the 'pickaxe' entry in
+ linkgit:gitdiffcore[7] for more details.
--pickaxe-all::
When -S finds a change, show all the changes in that