Adding a note explaining the transport configuration behavior in azurerm_container_app

[Chambras]

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Description

• Small update to the azurerm_container_app resource explaining to set exposed_port and target_port if transport is set to tcp.
• Cleaned some markdown linting warnings as well.

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This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #26902

[katbyte]

Thanks @Chambras - LGTM 🚜

[github-actions]

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