Remove outdated mentions of shouldComponentUpdate/PureCoponent

[sebastiancarlos]

Description

These should be replaced by React.memo.

The outdated mentions can be found at:

• https://reactnative.dev/docs/next/animations#setnativeprops
• https://reactnative.dev/docs/next/performance#common-sources-of-performance-problems

Documentation version

next, and likely older

[github-actions[bot]]

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[sebastiancarlos]

This is still an issue