Update parameter descriptions and typos

[picccard]

Overview/Summary

All hubNetworking.parameters.x.json comes with an ipRange for the AzureFirewallManagementSubnet (10.10.253.0/24) that is out of range for the hub-vNet (10.20.0.0/16).

PR also include some general parameter description hygiene, removal of default value as reported in #410

This PR fixes/adds/changes/removes

1. Fixes faulty default ipRange for AzureFirewallManagementSubnet in parameter files for hubNetworking
2. Updates the description for some of the parameters in hubNetworking
3. Removes some default value from parameter description text
   3.1. Kept descriptions with Default: Empty String & Default: Empty Array & Default: Empty Object as these empty values does not show up in the generated docs.
   3.2

Breaking Changes

None

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues
• (ALZ Bicep Core Team Only) Associated it with relevant ADO Items
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated one or more of the following tests (if required)
  • Unit
  • Linting
  • E2E (End-To-End)
  • ValidateAzCloud (Base validation in Azure Cloud)
  • ValidateMcCloud (Base validation in Azure China Cloud)
• Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Wiki Docs etc.)
• If relevant, created or updated Code Tours here

[jtracey93]

LGTM, thanks @picccard

[jtracey93]

/azp run validateazcloud

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[jtracey93]

/azp run validateazcloud

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