Lindex return code change for index is out of range.

[hwware]

This request is to cover return value changes implemented as part of redis/redis#12769.

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[dwdougherty]

Hello Wen Hui. I'm one of the Redis technical writers. In this file on the main Redis source repo, there's the following definition:

      "reply_schema": {
           "oneOf": [
               {
                   "type": "null",
                   "description": "Index is out of range"
               },
               {
                   "description": "The requested element",
                   "type": "string"
               }
           ]
       },

If that reference is not correct, then it should also be amended.

[hwware]

Thank you for reminding the details, I have updated the reply_schema in source repo as well. Please wait until redis/redis#11924 gets merged. so that there will not be any confusions.

Thank you.

[dwdougherty]

Thanks, Wen Hui. Looks like this is going into 8.0, so I'll wait until that's out to merge this PR.

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