Update comments on command args, and a misleading error reply (#10645)

Updated the comments for:
info command
lmpopCommand and blmpopCommand
sinterGenericCommand 

Fix the missing "key" words in the srandmemberCommand function
For LPOS command, when rank is 0, prompt user that rank could be
positive number or negative number, and add a test for it

1 files changed, 4 insertions, 3 deletions

diff --git a/src/t_list.c b/src/t_list.c
index 1cd3fb1a5..705da219c 100644
--- a/src/t_list.c
+++ b/src/t_list.c
@@ -679,7 +679,8 @@ void lposCommand(client *c) {
                 return;
             if (rank == 0) {
                 addReplyError(c,"RANK can't be zero: use 1 to start from "
-                                "the first match, 2 from the second, ...");
+                                "the first match, 2 from the second ... "
+                                "or use negative to start from the end of the list");
                 return;
             }
         } else if (!strcasecmp(opt,"COUNT") && moreargs) {
@@ -1197,12 +1198,12 @@ void lmpopGenericCommand(client *c, int numkeys_idx, int is_block) {
     }
 }
 
-/* LMPOP numkeys [<key> ...] LEFT|RIGHT [COUNT count] */
+/* LMPOP numkeys <key> [<key> ...] (LEFT|RIGHT) [COUNT count] */
 void lmpopCommand(client *c) {
     lmpopGenericCommand(c, 1, 0);
 }
 
-/* BLMPOP timeout numkeys [<key> ...] LEFT|RIGHT [COUNT count] */
+/* BLMPOP timeout numkeys <key> [<key> ...] (LEFT|RIGHT) [COUNT count] */
 void blmpopCommand(client *c) {
     lmpopGenericCommand(c, 2, 1);
 }