Missing properties in `microsoft.graph.titleArea` for Beta

[rkodev]

Beta docs is missing properties in the model microsoft.graph.titleArea.
These properties are returned by the API but are not defined on the model

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[irvinesunday]

@rkodev, please link doc ref. link if you can

[rkodev]

@irvinesunday Here is the docs link https://learn.microsoft.com/en-us/graph/api/sitepage-create?view=graph-rest-beta

[irvinesunday]

Issue is temporarily blocked by: #282