docs: minor - highlight "verify:sourcify" subtask, based on feedback …

[bguiz]

…from @schaable

• Ref: Unrelated Etherscan verification message appears when verifying with a custom Sourcify instance #4776 (comment)

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 7, 2024 8:06am

[schaable]

As the last published version of hardhat-verify this would be incorrect, see here. You can verify both providers with the same task, and control which one is executed through the config.

[bguiz]

Ah ok, if so this PR is redundant. Closing!