Fix typos in comments.

Backpatch to all supported versions, where applicable, to make backpatching
of future fixes go more smoothly.

Josh Soref

Discussion: https://www.postgresql.org/message-id/CACZqfqCf+5qRztLPgmmosr-B0Ye4srWzzw_mo4c_8_B_mtjmJQ@mail.gmail.com

src/backend/utils/adt/formatting.c

@@ -2285,7 +2285,7 @@ seq_search(char *name, char **array, int type, int max, int *len)
 
 	for (last = 0, a = array; *a != NULL; a++)
 	{
-		/* comperate first chars */
+		/* compare first chars */
 		if (*name != **a)
 			continue;
 

src/backend/utils/adt/tsrank.c

@@ -777,7 +777,7 @@ calc_rank_cd(float4 *arrdata, TSVector txt, TSQuery query, int method)
 
 		/*
 		 * if doc are big enough then ext.q may be equal to ext.p due to limit
-		 * of posional information. In this case we approximate number of
+		 * of positional information. In this case we approximate number of
 		 * noise word as half cover's length
 		 */
 		nNoise = (ext.q - ext.p) - (ext.end - ext.begin);
@@ -786,7 +786,7 @@ calc_rank_cd(float4 *arrdata, TSVector txt, TSQuery query, int method)
 		Wdoc += Cpos / ((double) (1 + nNoise));
 
 		CurExtPos = ((double) (ext.q + ext.p)) / 2.0;
-		if (NExtent > 0 && CurExtPos > PrevExtPos		/* prevent devision by
+		if (NExtent > 0 && CurExtPos > PrevExtPos		/* prevent division by
 														 * zero in a case of
 				multiple lexize */ )
 			SumDist += 1.0 / (CurExtPos - PrevExtPos);

src/backend/utils/adt/windowfuncs.c

@@ -342,7 +342,7 @@ window_lag(PG_FUNCTION_ARGS)
 
 /*
  * lag_with_offset
- * returns the value of VE evelulated on a row that is OFFSET
+ * returns the value of VE evaluated on a row that is OFFSET
  * rows before the current row within a partition,
  * per spec.
  */

src/backend/utils/misc/Makefile

@@ -18,7 +18,7 @@ OBJS = guc.o help_config.o pg_rusage.o ps_status.o superuser.o tzparser.o \
        rbtree.o
 
 # This location might depend on the installation directories. Therefore
-# we can't subsitute it into pg_config.h.
+# we can't substitute it into pg_config.h.
 ifdef krb_srvtab
 override CPPFLAGS += -DPG_KRB_SRVTAB='"$(krb_srvtab)"'
 endif