Fix some translatable strings in pg_basebackup and pg_combinebackup

Two translatable strings introduced in dc21234005 were split into two
parts, making their translation harder than necessary.

Author: Kyotaro Horiguchi
Discussion: https://postgr.es/m/20231225.134747.2287499067164862136.horikyota.ntt@gmail.com

src/bin/pg_basebackup/pg_basebackup.c

@@ -396,8 +396,8 @@ usage(void)
 	printf(_("\nOptions controlling the output:\n"));
 	printf(_("  -D, --pgdata=DIRECTORY receive base backup into directory\n"));
 	printf(_("  -F, --format=p|t       output format (plain (default), tar)\n"));
-	printf(_("  -i, --incremental=OLDMANIFEST\n"));
-	printf(_("                         take incremental backup\n"));
+	printf(_("  -i, --incremental=OLDMANIFEST\n"
+			 "                         take incremental backup\n"));
 	printf(_("  -r, --max-rate=RATE    maximum transfer rate to transfer data directory\n"
 			 "                         (in kB/s, or use suffix \"k\" or \"M\")\n"));
 	printf(_("  -R, --write-recovery-conf\n"

src/bin/pg_combinebackup/pg_combinebackup.c

@@ -669,8 +669,8 @@ help(const char *progname)
 	printf(_("  -n, --dry-run             don't actually do anything\n"));
 	printf(_("  -N, --no-sync             do not wait for changes to be written safely to disk\n"));
 	printf(_("  -o, --output              output directory\n"));
-	printf(_("  -T, --tablespace-mapping=OLDDIR=NEWDIR\n"));
-	printf(_("                            relocate tablespace in OLDDIR to NEWDIR\n"));
+	printf(_("  -T, --tablespace-mapping=OLDDIR=NEWDIR\n"
+			 "                            relocate tablespace in OLDDIR to NEWDIR\n"));
 	printf(_("      --manifest-checksums=SHA{224,256,384,512}|CRC32C|NONE\n"
 			 "                            use algorithm for manifest checksums\n"));
 	printf(_("      --no-manifest         suppress generation of backup manifest\n"));