Docs: azurerm_*_function_app - update docs to include vnet_image_pull_enabled property

[catriona-m]

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Description

Updating docs to include vnet_image_pull_enabled property and adds missing 1.3 option for the scm_minimum_tls_version in the docs

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

[katbyte]

LTM 🛋️