fix: generate-command-markdown.py doesn't work --commands option

[JamBalaya56562]

Description

I ran the ./scripts/generate-command-markdown.py --commands pull to update my another PR.
However, it shows the below error.

Traceback (most recent call last):
  File "/home/jam/workspace/sapling/website/./scripts/generate-command-markdown.py", line 462, in <module>
    main(args)
    ~~~~^^^^^^
  File "/home/jam/workspace/sapling/website/./scripts/generate-command-markdown.py", line 403, in main
    command_list = args.commands.split(",")
                   ^^^^^^^^^^^^^^^^^^^
AttributeError: 'list' object has no attribute 'split'

To fix this error, I removed the split(",") and ran again.
Finally I could regenerate the pull.md with the SUCCESS message.

extracting documentation from Sapling ...
translating rst to markdown ...
Regenerating documentation ...
Signing files ...
SUCCESS

In conclusion, I fixed generate-command-markdown.py --commands option.

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