Add missing periods to comments.

src/include/nodes/pathnodes.h

@@ -2447,9 +2447,9 @@ typedef struct
 /*
  * Struct for extra information passed to subroutines of grouping_planner
  *
- * limit_needed is true if we actually need a Limit plan node
+ * limit_needed is true if we actually need a Limit plan node.
  * limit_tuples is an estimated bound on the number of output tuples,
- *		or -1 if no LIMIT or couldn't estimate
+ *		or -1 if no LIMIT or couldn't estimate.
  * count_est and offset_est are the estimated values of the LIMIT and OFFSET
  * 		expressions computed by preprocess_limit() (see comments for
  * 		preprocess_limit() for more information).