unposted: _grep: fix freebsd grep variant pattern

oliver shared a user report that grep completion doesn't work properly
on macos any more. this is because it no longer uses gnu grep -- it's
been freebsd grep since at least 2019

there appear to be other inaccuracies in this function which we should
revisit, but this will solve the issue as reported

1 files changed, 3 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index dd9d712da..2226e6679 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2026-07-09  dana  <dana@dana.is>
 
+	* unposted: Completion/Unix/Command/_grep: fix freebsd grep
+	variant pattern
+
 	* unposted (see 54915):
 	Completion/Darwin/Type/_mac_files_for_application: remove
 	_mac_files_for_application