Fix comment from commit 22655aa231.

Per automated complaint from BF animal koel this needed to be
re-indented, but there was also a typo.  Back-patch to 16.

src/backend/access/heap/heapam.c

@@ -1803,10 +1803,10 @@ ReleaseBulkInsertStatePin(BulkInsertState bistate)
 	bistate->current_buf = InvalidBuffer;
 
 	/*
-	 * Despite the name, we also reset bulk relation extension
-	 * state. Otherwise we can end up erroring out due to looking for free
-	 * space in ->next_free of one partition, even though ->next_free was set
-	 * when extending another partition. It's obviously also could be bad for
+	 * Despite the name, we also reset bulk relation extension state.
+	 * Otherwise we can end up erroring out due to looking for free space in
+	 * ->next_free of one partition, even though ->next_free was set when
+	 * extending another partition. It could obviously also be bad for
 	 * efficiency to look at existing blocks at offsets from another
 	 * partition, even if we don't error out.
 	 */