Fix: Wrong link used in PublicClient multicall docs

[0xA1337]

This PR fixes a link that was incorrect in the docs of the PublicClient multicall config.

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PR-Codex overview

The focus of this PR is to fix a typo in a link anchor in the public.md file related to customizing multicall options.

Detailed summary

• Fixed a typo in a link anchor from #batch-multicall-batchsize-optional to #batchmulticallbatchsize-optional in public.md.

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