docs: fix broken markdown link in best-practices.mdx

[qsysvcore]

Summary

Fix broken markdown link in best-practices.mdx

Problem

The markdown link for "Learn more" was malformed. The URL was missing its closing parenthesis, causing the link to render incorrectly and the trailing period to be interpreted as part of the URL.

Fix

- (see [transaction lifecycle](/how-abstract-works/architecture/transaction-lifecycle)). [Learn more ↗](https://docs.zksync.io/zksync-protocol/rollup/fee-model/how-we-charge-for-pubdata.
+ (see [transaction lifecycle](/how-abstract-works/architecture/transaction-lifecycle)). [Learn more ↗](https://docs.zksync.io/zksync-protocol/rollup/fee-model/how-we-charge-for-pubdata).

[cursor]

PR Summary

Low Risk
Low risk documentation-only change that corrects a single broken external link; no runtime behavior is affected.

Overview
Fixes a malformed Markdown link in how-abstract-works/evm-differences/best-practices.mdx by adding the missing closing parenthesis so the “Learn more” URL renders correctly (and doesn’t swallow trailing punctuation).

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