Docs on @cypher columnName

[angrykoala]

Description

Updated documentation for the @cypher directive in 4.0.0

implementation of these changes in #2769

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Latest commit: 863f311

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[Liam-Doodson]

These changes look good! I think the migration guide also needs an update for v4 because it makes columnName sound optional which will not be the case when this is released