Fix typo.

Reported-by: Amit Langote
Author: Amit Langote
Backpatch-through: 9.6, where it was introduced
Discussion: https://postgr.es/m/CA+HiwqFNADeukaaGRmTqANbed9Fd81gLi08AWe_F86_942Gspw@mail.gmail.com

src/backend/optimizer/path/allpaths.c

@@ -610,7 +610,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 
 			/*
 			 * Currently, parallel workers can't access the leader's temporary
-			 * tables.  We could possibly relax this if the wrote all of its
+			 * tables.  We could possibly relax this if we wrote all of its
 			 * local buffers at the start of the query and made no changes
 			 * thereafter (maybe we could allow hint bit changes), and if we
 			 * taught the workers to read them.  Writing a large number of