Update release notes and other docs for PS7.6-p5 release

[sdwheeler]

PR Summary

Update release notes and other docs for PS7.6-p5 release

• Fixes AB#494572
• Fixes The parameter -NativeFallback is added to Register-ArgumentCompleter to support registering a cover-all completer for native commands #12321
• Fixes Update PSReadline documentation for InvokePrompt behavior change. #12157
• Fixes Allow opt-out of the named-pipe listener using the environment variable 'POWERSHELL_DIAGNOSTICS_OPTOUT' #12403
• Fixes The PSDiagnostics module in PowerShell 7 will be updated to work with the "PowerShellCore" ETW provider #12091

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

PoliCheck Scan Report

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[learn-build-service-prod]

Learn Build status updates of commit 11fb30a:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.4/PSReadLine/About/about_PSReadLine_Functions.md	✅Succeeded	View (powershell-7.4)
reference/7.5/PSReadLine/About/about_PSReadLine_Functions.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Core/About/about_Arrays.md	✅Succeeded	View (powershell-7.6)
reference/7.6/Microsoft.PowerShell.Core/About/about_Environment_Variables.md	✅Succeeded	View (powershell-7.6)
reference/7.6/Microsoft.PowerShell.Core/About/about_Intrinsic_Members.md	✅Succeeded	View (powershell-7.6)
reference/7.6/Microsoft.PowerShell.Core/Register-ArgumentCompleter.md	✅Succeeded	View (powershell-7.6)
reference/7.6/PSDiagnostics/Disable-PSTrace.md	✅Succeeded	View (powershell-7.6)
reference/7.6/PSDiagnostics/Enable-PSTrace.md	✅Succeeded	View (powershell-7.6)
reference/7.6/PSReadLine/About/about_PSReadLine_Functions.md	✅Succeeded	View (powershell-7.6)
reference/docs-conceptual/install/install-rhel.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/Installing-PowerShell-on-Windows.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/security/security-features.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-76.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit 2da5bda:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.4/PSReadLine/About/about_PSReadLine_Functions.md	✅Succeeded	View (powershell-7.4)
reference/7.5/PSReadLine/About/about_PSReadLine_Functions.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Core/About/about_Arrays.md	✅Succeeded	View (powershell-7.6)
reference/7.6/Microsoft.PowerShell.Core/About/about_Environment_Variables.md	✅Succeeded	View (powershell-7.6)
reference/7.6/Microsoft.PowerShell.Core/About/about_Intrinsic_Members.md	✅Succeeded	View (powershell-7.6)
reference/7.6/Microsoft.PowerShell.Core/Register-ArgumentCompleter.md	✅Succeeded	View (powershell-7.6)
reference/7.6/PSDiagnostics/Disable-PSTrace.md	✅Succeeded	View (powershell-7.6)
reference/7.6/PSDiagnostics/Enable-PSTrace.md	✅Succeeded	View (powershell-7.6)
reference/7.6/PSReadLine/About/about_PSReadLine_Functions.md	✅Succeeded	View (powershell-7.6)
reference/docs-conceptual/install/install-rhel.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/install/Installing-PowerShell-on-Windows.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/security/security-features.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-76.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.