Fix typos.

Etsuro Fujita

src/backend/utils/adt/pgstatfuncs.c

@@ -1712,7 +1712,7 @@ pg_stat_reset_shared(PG_FUNCTION_ARGS)
 	PG_RETURN_VOID();
 }
 
-/* Reset a a single counter in the current database */
+/* Reset a single counter in the current database */
 Datum
 pg_stat_reset_single_table_counters(PG_FUNCTION_ARGS)
 {

src/backend/utils/adt/tsgistidx.c

@@ -306,7 +306,7 @@ checkcondition_arr(void *checkval, QueryOperand *val)
 	/* Loop invariant: StopLow <= val < StopHigh */
 
 	/*
-	 * we are not able to find a a prefix by hash value
+	 * we are not able to find a prefix by hash value
 	 */
 	if (val->prefix)
 		return true;
@@ -329,7 +329,7 @@ static bool
 checkcondition_bit(void *checkval, QueryOperand *val)
 {
 	/*
-	 * we are not able to find a a prefix in signature tree
+	 * we are not able to find a prefix in signature tree
 	 */
 	if (val->prefix)
 		return true;

src/backend/utils/adt/tsquery.c

@@ -456,10 +456,10 @@ findoprnd(QueryItem *ptr, int size)
 
 
 /*
- * Each value (operand) in the query is be passed to pushval. pushval can
+ * Each value (operand) in the query is passed to pushval. pushval can
  * transform the simple value to an arbitrarily complex expression using
  * pushValue and pushOperator. It must push a single value with pushValue,
- * a complete expression with all operands, or a a stopword placeholder
+ * a complete expression with all operands, or a stopword placeholder
  * with pushStop, otherwise the prefix notation representation will be broken,
  * having an operator with no operand.
  *

src/backend/utils/time/snapmgr.c

@@ -283,7 +283,7 @@ GetNonHistoricCatalogSnapshot(Oid relid)
 {
 	/*
 	 * If the caller is trying to scan a relation that has no syscache, no
-	 * catcache invalidations will be sent when it is updated.  For a a few
+	 * catcache invalidations will be sent when it is updated.  For a few
 	 * key relations, snapshot invalidations are sent instead.  If we're
 	 * trying to scan a relation for which neither catcache nor snapshot
 	 * invalidations are sent, we must refresh the snapshot every time.