Updated Get-HotFix Credential parameter, added notes for PS7 changes

[davidsmatlak]

PR Summary

• Updated Get-HotFix Credential parameter description with SecureString information.
• Updated PS 7 docs that have new parameters:
  • Publish-Module - PR Fixes #4504 - Added SkipAutomaticTags parameter to PS 7 Publish-Module #4505
  • Update-Module - PR Fixes #4529 - added Scope parameter to PS7 Update-Module #4531
  • Set-PSReadLineOption - PR Fixes #4848 - Added ViModeChangeHandler parameter description #4850

PR Context

Select the type(s) of documents being changed.

Cmdlet reference & about_ topics

• Version 7 content
• Version 6 content
• Version 5.1 content

Conceptual articles

• Fundamental conceptual articles
• Script sample articles
• DSC articles
• Gallery articles
• JEA articles
• WMF articles
• SDK articles

PR Checklist

• I have read the contributors guide and followed the style and process guidelines
• PR has a meaningful title
• PR is targeted at the staging branch
• All relevant versions updated
• Includes content related to issues and PRs - see Closing issues using keywords.
• This PR is ready to merge and is not Work in Progress
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the
    title and remove the prefix when the PR is ready.

[opbld34]

Docs Build status updates of commit df3ea0a:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Management/Get-HotFix.md	✅Succeeded	View (powershell-5.1)
reference/7/Microsoft.PowerShell.Management/Get-HotFix.md	✅Succeeded	View (powershell-7)
reference/7/PSReadLine/Set-PSReadlineOption.md	✅Succeeded	View (powershell-7)
reference/7/PowerShellGet/Publish-Module.md	✅Succeeded	View (powershell-7)
reference/7/PowerShellGet/Update-Module.md	✅Succeeded	View (powershell-7)

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