docs: use API xref for SignatureChecker in multisig guide

[suyua9]

Summary\n- replace the hard-coded GitHub link in the multisig guide with the existing API xref\n- keep the guide inside the docs site's own navigation instead of sending readers to a branch-specific repository URL\n\n## Testing\n- not run (docs link target update only)

[changeset-bot]

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Latest commit: ab33b13

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Reviewing files that changed from the base of the PR and between 9cfdccd and ab33b13.

📒 Files selected for processing (1)

• docs/modules/ROOT/pages/multisig.adoc

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Walkthrough

This is a documentation-only change that replaces an external hyperlink to OpenZeppelin's SignatureChecker.sol source code with an internal AsciiDoc cross-reference pointing to the project's own API documentation. The change updates the multisig documentation page to use xref:api:utils/cryptography.adoc#SignatureChecker instead of the external link.

Possibly related PRs

• docs(accounts): fix AbstractSigner xrefs to utils/cryptography.adoc #6154: Also updates AsciiDoc cross-references to the same target file (utils/cryptography.adoc) for documentation consistency.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: replacing a hard-coded link with an AsciiDoc cross-reference for SignatureChecker in the multisig documentation guide.
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation for replacing the external GitHub link with an internal API cross-reference and clarifying the testing approach for this docs-only change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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