Improve some error messages.

It is not our usual style to use "we" in the error messages.

Author: Kyotaro Horiguchi
Reviewed-By: Amit Kapila
Discussion: https://postgr.es/m/20220914.111507.13049297635620898.horikyota.ntt@gmail.com

src/backend/replication/pgoutput/pgoutput.c

@@ -441,13 +441,13 @@ pgoutput_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt,
 		if (data->protocol_version > LOGICALREP_PROTO_MAX_VERSION_NUM)
 			ereport(ERROR,
 					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("client sent proto_version=%d but we only support protocol %d or lower",
+					 errmsg("client sent proto_version=%d but server only supports protocol %d or lower",
 							data->protocol_version, LOGICALREP_PROTO_MAX_VERSION_NUM)));
 
 		if (data->protocol_version < LOGICALREP_PROTO_MIN_VERSION_NUM)
 			ereport(ERROR,
 					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("client sent proto_version=%d but we only support protocol %d or higher",
+					 errmsg("client sent proto_version=%d but server only supports protocol %d or higher",
 							data->protocol_version, LOGICALREP_PROTO_MIN_VERSION_NUM)));
 
 		if (data->publication_names == NIL)

src/backend/storage/file/fd.c

@@ -978,7 +978,7 @@ set_max_safe_fds(void)
 		ereport(FATAL,
 				(errcode(ERRCODE_INSUFFICIENT_RESOURCES),
 				 errmsg("insufficient file descriptors available to start server process"),
-				 errdetail("System allows %d, we need at least %d.",
+				 errdetail("System allows %d, server needs at least %d.",
 						   max_safe_fds + NUM_RESERVED_FDS,
 						   FD_MINFREE + NUM_RESERVED_FDS)));