Update version number from 7.1 to 7.2

[tholabrk]

PR Summary

PR Context

Select the area of the Table of Contents containing the documents being changed.

Conceptual content

• Overview and Install
• Learning PowerShell
  • PowerShell 101
  • Deep dives
  • Sample scripts
  • Remoting
• Release notes (What's New)
• Windows PowerShell
  • WMF, ISE, release notes, etc.
• DSC articles
• Community resources
• Gallery articles
• Scripting and development
  • Language Spec
  • Legacy SDK

Cmdlet reference & about_ topics

• Preview content
• Version 7.2 content
• Version 7.1 content
• Version 7.0 content
• Version 5.1 content

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.

[opbld32]

Docs Build status updates of commit 8ece9e6:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• [Error: RuningBuildFailed] Some unexpected errors happened when running build, please open a ticket in https://aka.ms/SiteHelp and include the error report for our team to troubleshoot

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[opbld33]

Docs Build status updates of commit 8ece9e6:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/install/Installing-PowerShell-on-Windows.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel