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Creates a CssCombinator from the given CssTokenKind.
This function maps specific token kinds to their corresponding combinators:
CssTokenKind.Greater : ChildCombinator (" > ")
CssTokenKind.Tilde : NextSiblingCombinator (" ~ ")
CssTokenKind.Plus : SubsequentSiblingCombinator (" + ")
For any other token kind, including null, the function returns null.
Return
The corresponding CssCombinator, or null if no matching combinator is found.
Parameters
tokenKind
The CssTokenKind to convert to a combinator.