docs: remove stale ERC20VotesComp reference

[MozirDmitriy]

The governance guide was still suggesting that ERC20VotesComp is part of the current module set, even though it was removed in v5.0. This commit updates the compatibility section to describe only ERC20Votes as the voting extension used with Governor.

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Latest commit: 8ca87e4

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[coderabbitai]

Walkthrough

The governance documentation has been updated to consolidate the ERC20Votes extension description. The entry previously describing two variants—ERC20Votes and ERC20VotesComp—has been renamed and reorganized to present a single unified ERC20Votes extension. The updated documentation now describes core features including support for token supplies exceeding 2^96 and voting power history that can be delegated and queried at past timepoints. References to the Comp variant and its compatibility considerations have been removed. No method signatures or interface changes were introduced.

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Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: removing the stale ERC20VotesComp reference from the documentation, which is the primary objective of this PR.
Description check	✅ Passed	The description is directly related to the changeset, explaining the context (ERC20VotesComp removal in v5.0) and the specific change made (updating compatibility section to reference only ERC20Votes).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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🔇 Additional comments (1)

docs/modules/ROOT/pages/governance.adoc (1)

17-19: Documentation update correctly removes deprecated ERC20VotesComp reference.

The section consolidation cleanly removes the ERC20VotesComp variant, which was removed in OpenZeppelin Contracts v5.0.0. The updated ERC20Votes description accurately reflects current behavior—the extension now supports token supplies greater than 2^96 (previously limited to 96 bits in the Comp variant) and maintains voting power history. The remaining GovernorTimelockCompound reference at line 29 remains appropriate as that module still has a Control variant.

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