fix typo in got.1: "only if" -> "if only"; pointed out by tracey
diff --git a/got/got.1 b/got/got.1
index 236be0b..d23f9ef 100644
--- a/got/got.1
+++ b/got/got.1
@@ -1525,7 +1525,7 @@ The
.Fl f
option folds all commits into one commit, while the
.Fl m
-option is used only if log messages need to be edited.
+option is used if only log messages need to be edited.
.Pp
The format of the histedit script is line-based.
Each line in the script begins with a command name, followed by