Fix some commands key spec in json files (#10779)

There are some commands that has the wrong key specs.
This PR adds a key-spec related check in generate-command-code.py.
Check if the index is valid, or if there is an unused index.

The check result will look like:
```
[root]# python utils/generate-command-code.py
Processing json files...
Linking container command to subcommands...
Checking all commands...
command: RESTORE_ASKING may have unused key_spec
command: RENAME may have unused key_spec
command: PFDEBUG may have unused key_spec
command: WATCH key_specs missing flags
command: LCS arg: key2 key_spec_index error
command: RENAMENX may have unused key_spec
Error: There are errors in the commands check, please check the above logs.
```

The following commands have been fixed according to the check results:
- RESTORE ASKING: add missing arguments section (and history section)
- RENAME: newkey's key_spec_index should be 1
- PFDEBUG: add missing arguments (and change the arity from -3 to 3)
- WATCH: add missing key_specs flags: RO, like EXIST (it allow you to know the key exists, or is modified, but doesn't "leak" the data)
- LCS: key2 key_spec_index error, there is only one key-spec
- RENAMENX: newkey's key_spec_index should be 1

1 files changed, 1 insertions, 1 deletions

diff --git a/src/commands/renamenx.json b/src/commands/renamenx.json
index 99c318ca7..afa4f658b 100644
--- a/src/commands/renamenx.json
+++ b/src/commands/renamenx.json
@@ -67,7 +67,7 @@
             {
                 "name": "newkey",
                 "type": "key",
-                "key_spec_index": 0
+                "key_spec_index": 1
             }
         ]
     }