Add missing comma in memory/xgroup command help message. (#9210)

This would have resulted in missing newline in the help message

src/object.c

@@ -1293,7 +1293,7 @@ void memoryCommand(client *c) {
         const char *help[] = {
 "DOCTOR",
 "    Return memory problems reports.",
-"MALLOC-STATS"
+"MALLOC-STATS",
 "    Return internal statistics report from the memory allocator.",
 "PURGE",
 "    Attempt to purge dirty pages for reclamation by the allocator.",

src/t_stream.c

@@ -2393,7 +2393,7 @@ void xgroupCommand(client *c) {
 "    Create a new consumer in the specified group.",
 "DELCONSUMER <key> <groupname> <consumer>",
 "    Remove the specified consumer.",
-"DESTROY <key> <groupname>"
+"DESTROY <key> <groupname>",
 "    Remove the specified group.",
 "SETID <key> <groupname> <id|$>",
 "    Set the current group ID.",