[lit-virtualizer] Fixes #4505 - Adds documentation for lit-virtualizer/grid

[JamesIves]

Adds documentation for lit-virtualizer grid layout.

Documentation was produced using examples from the Playground / code. Please let me know if you feel I need to go into more detail in any specific area.

Closes #4505

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Latest commit: e44d2ca16018386d830b1937da3db6336b2382ee

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[JamesIves]

Bumpity bump @graynorton