Change "..." to cstring in old input/output function comments.

It was not clear what the "..." meant.

Author: Steve Chavez
Discussion: https://www.postgresql.org/message-id/CAGRrpzZzeh7zC3yaVG9di%3DydJ%2BiHwdXnFPB3evGFKvC1zf6ajA@mail.gmail.com

src/backend/utils/adt/name.c

@@ -38,7 +38,7 @@
 
 
 /*
- *		namein	- converts "..." to internal representation
+ *		namein	- converts cstring to internal representation
  *
  *		Note:
  *				[Old] Currently if strlen(s) < NAMEDATALEN, the extra chars are nulls
@@ -65,7 +65,7 @@ namein(PG_FUNCTION_ARGS)
 }
 
 /*
- *		nameout - converts internal representation to "..."
+ *		nameout - converts internal representation to cstring
  */
 Datum
 nameout(PG_FUNCTION_ARGS)

src/backend/utils/adt/varlena.c

@@ -571,7 +571,7 @@ bytea_string_agg_finalfn(PG_FUNCTION_ARGS)
 }
 
 /*
- *		textin			- converts "..." to internal representation
+ *		textin			- converts cstring to internal representation
  */
 Datum
 textin(PG_FUNCTION_ARGS)
@@ -582,7 +582,7 @@ textin(PG_FUNCTION_ARGS)
 }
 
 /*
- *		textout			- converts internal representation to "..."
+ *		textout			- converts internal representation to cstring
  */
 Datum
 textout(PG_FUNCTION_ARGS)
@@ -626,7 +626,7 @@ textsend(PG_FUNCTION_ARGS)
 
 
 /*
- *		unknownin			- converts "..." to internal representation
+ *		unknownin			- converts cstring to internal representation
  */
 Datum
 unknownin(PG_FUNCTION_ARGS)
@@ -638,7 +638,7 @@ unknownin(PG_FUNCTION_ARGS)
 }
 
 /*
- *		unknownout			- converts internal representation to "..."
+ *		unknownout			- converts internal representation to cstring
  */
 Datum
 unknownout(PG_FUNCTION_ARGS)