Add isolated trust model example to the documentation for the Reset_AzAttestationPolicy cmdlet (#12789)

* Added example for Reset_AzAttestationPolicy for the isolated trust model

* Update ChangeLog.md

Remove changelog.md since the PR only contains document update so that we don't need a new release for document update only.

Co-authored-by: Jin Lei <[email protected]>

Author: gkostal

src/Attestation/Attestation/help/Reset-AzAttestationPolicy.md

@@ -36,6 +36,14 @@ PS C:\> Reset-AzAttestationPolicy -Name pshtest -ResourceGroupName psh-test-rg -
 
 Reset the policy to the default for the Attestation Provider *pshtest* for Tee type *SgxEnclave*.
 
+### Example 2
+```powershell
+PS C:\> $resetJwt = Get-Content -Path .\reset.policy.txt.signed.txt
+PS C:\> Reset-AzAttestationPolicy -Name pshtest -ResourceGroupName psh-test-rg -Tee SgxEnclave -Policy $resetJwt
+```
+
+If the Attestation Provider *pshtest* is configured to use the isolated trust model, reset the policy to the default for Tee type *SgxEnclave* by including a signed policy.
+
 ## PARAMETERS
 
 ### -DefaultProfile