Fix issues flagged in CATS report

[sdwheeler]

• Fixed dates in metadata header
• Deleted unused file
• Fixed headers to remove multiple H1's and adjust H2-H4's

[zjalexander]

Docs Build status updates of commit 7f9d357:

🕙 Full build: the average full build time is 12 min(s) 58 sec(s), this is based on the last 80 build(s) for this repository.

[zjalexander]

Docs Build status updates of commit 7f9d357:

✅ Validation status: passed

File	Status	Preview URL	Details
dsc/configurations/reboot-a-node.md	✅Succeeded	View
reference/docs-conceptual/samples/Creating-Get-WinEvent-queries-with-FilterHashtable.md	✅Succeeded	View (powershell-3.0) View (powershell-4.0) View (powershell-5.0) View (powershell-5.1) View (powershell-6)
reference/docs-conceptual/samples/Decode-PowerShell-Command-from-a-Running-Process.md	✅Succeeded	View (powershell-3.0) View (powershell-4.0) View (powershell-5.0) View (powershell-5.1) View (powershell-6)
reference/docs-conceptual/samples/Working-with-Objects.md	✅Succeeded
wmf/whats-new/class-overview.md	✅Succeeded	View

For more details, please refer to the build report.

Note: If you changed an existing file name or deleted a file, broken links in other files to the deleted or renamed file are listed only in the full build report.

[DCtheGeek]

LGTM