Fix a grammatical error.

PR:		140765
Submitted by:	Benjamin Kaduk <kaduk@mit.edu>

portlint.1

@@ -48,7 +48,7 @@ Some of the committers prefer
 .Pa ${VARIABLE}
 instead of
 .Pa $(VARIABLE) ,
-even though they are semantically same.
+even though they are semantically the same.
 .It Fl c
 Committer flag.
 It will add several checks useful only for committers.