builtin/commit.c: extract ignore_non_trailer() helper function

diff --git a/Documentation/git-replace.txt b/Documentation/git-replace.txt
index 414000ef7d74e96dae5db7c86fd6bffc63b353cd..f373ab48d4d575d847408e333b5bfb747d1a75a2 100644 (file)
--- a/Documentation/git-replace.txt
+++ b/Documentation/git-replace.txt
@@ -26,6 +26,7 @@ This restriction can be bypassed using `-f`.
 Unless `-f` is given, the 'replace' reference must not yet exist.
 
 There is no other restriction on the replaced and replacement objects.
+Merge commits can be replaced by non-merge commits and vice versa.
 
 Replacement references will be used by default by all Git commands
 except those doing reachability traversal (prune, pack transfer and