[Key Vault] Update Certificates and Keys CHANGELOGs (Azure#49584)

* Update Keys changelog

* Update Certificates Changelog

Author: JonathanCrd

sdk/keyvault/Azure.Security.KeyVault.Certificates/CHANGELOG.md

@@ -2,12 +2,20 @@
 
 ## 4.8.0-beta.2 (Unreleased)
 
+### Acknowledgments
+
+Thank you to our developer community members who helped to make the Key Vault client libraries better with their contributions to this release:
+
+- James Gould _([GitHub](https://github.com/james-gould))_
+
 ### Features Added
 
 ### Breaking Changes
 
 ### Bugs Fixed
 
+- Removed additional forward slash in `RestoreCertificateBackup` and `RestoreCertificateBackupAsync`.
+
 ### Other Changes
 
 ## 4.8.0-beta.1 (2025-04-08)

sdk/keyvault/Azure.Security.KeyVault.Keys/CHANGELOG.md

@@ -2,12 +2,20 @@
 
 ## 4.8.0-beta.2 (Unreleased)
 
+### Acknowledgments
+
+Thank you to our developer community members who helped to make the Key Vault client libraries better with their contributions to this release:
+
+- James Gould _([GitHub](https://github.com/james-gould))_
+
 ### Features Added
 
 ### Breaking Changes
 
 ### Bugs Fixed
 
+- Removed additional forward slash in `RestoreKeyBackup` and `RestoreKeyBackupAsync`.
+
 ### Other Changes
 
 ## 4.8.0-beta.1 (2025-04-08)