Add parameter descriptions to CallInvite constructors

[Copilot]

Description

Addresses review feedback from #55159 to add missing parameter descriptions to all CallInvite class constructors.

All five constructors now include proper XML documentation for their parameters, following the established pattern used throughout the Azure SDK codebase:

• CallInvite(PhoneNumberIdentifier, PhoneNumberIdentifier) - Added descriptions for target phone number and caller ID parameters
• CallInvite(CommunicationUserIdentifier) - Added description for Communication User target
• CallInvite(MicrosoftTeamsUserIdentifier) - Added description for Microsoft Teams User target
• CallInvite(TeamsExtensionUserIdentifier) - Added description for Teams Extension User target
• CallInvite(MicrosoftTeamsAppIdentifier) - Added description for Microsoft Teams App target

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