[FLINK-24884][runtime-web] fix bug of incorrect type description.

[liuyongvs]

What is the purpose of the change

(For example: This pull request makes task deployment go through the blob server, rather than through RPC. That way we avoid re-transferring them on each deployment (during recovery).)

Brief change log

• simple bug fix

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CI report:

• 71fb665 Azure: SUCCESS

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Automated Checks

Last check on commit 825fc91 (Fri Nov 12 09:08:02 UTC 2021)

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• ❓ 1. The [description] looks good.
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[Airblader]

If you rebase this branch you'll notice that SafeAny no longer exists. Please use unknown instead.

[liuyongvs]

If you rebase this branch you'll notice that SafeAny no longer exists. Please use unknown instead.

hi @Airblader sorry for late response, i modify it to unknown

[Airblader]

Thanks! I'll squash the commits during the merge.