Message style improvements

Author: petere

src/backend/backup/basebackup.c

@@ -908,7 +908,7 @@ parse_basebackup_options(List *options, basebackup_options *opt)
 		if (target_detail_str != NULL)
 			ereport(ERROR,
 					(errcode(ERRCODE_SYNTAX_ERROR),
-					 errmsg("target '%s' does not accept a target detail",
+					 errmsg("target \"%s\" does not accept a target detail",
 							target_str)));
 		opt->send_to_client = true;
 	}

src/backend/backup/basebackup_target.c

@@ -215,7 +215,7 @@ reject_target_detail(char *target, char *target_detail)
 	if (target_detail != NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_SYNTAX_ERROR),
-				 errmsg("target '%s' does not accept a target detail",
+				 errmsg("target \"%s\" does not accept a target detail",
 						target)));
 
 	return NULL;
@@ -234,7 +234,7 @@ server_check_detail(char *target, char *target_detail)
 	if (target_detail == NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_SYNTAX_ERROR),
-				 errmsg("target '%s' requires a target detail",
+				 errmsg("target \"%s\" requires a target detail",
 						target)));
 
 	return target_detail;