[Key Vault] Fix certificate model property docstrings to include descriptions (#42067)

* Initial plan

* Fix certificate model property docstrings - add descriptions to rtype-only docstrings

Co-authored-by: mccoyp <39780829+mccoyp@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mccoyp <39780829+mccoyp@users.noreply.github.com>

Author: Copilot

sdk/keyvault/azure-keyvault-certificates/azure/keyvault/certificates/_models.py

@@ -61,22 +61,30 @@ def _from_admin_detail(cls, admin_detail: models.AdministratorDetails) -> "Admin
 
     @property
     def email(self) -> Optional[str]:
-        """:rtype: str or None"""
+        """Email address of the issuer.
+
+        :rtype: str or None"""
         return self._email
 
     @property
     def first_name(self) -> Optional[str]:
-        """:rtype: str or None"""
+        """First name of the issuer.
+
+        :rtype: str or None"""
         return self._first_name
 
     @property
     def last_name(self) -> Optional[str]:
-        """:rtype: str or None"""
+        """Last name of the issuer.
+
+        :rtype: str or None"""
         return self._last_name
 
     @property
     def phone(self) -> Optional[str]:
-        """:rtype: str or None"""
+        """Phone number of the issuer.
+
+        :rtype: str or None"""
         return self._phone
 
 
@@ -1134,17 +1142,23 @@ def _from_certificate_contacts_item(cls, contact_item: models.Contact) -> "Certi
 
     @property
     def email(self) -> Optional[str]:
-        """:rtype: str or None"""
+        """Email address of a contact for the certificate.
+
+        :rtype: str or None"""
         return self._email
 
     @property
     def name(self) -> Optional[str]:
-        """:rtype: str or None"""
+        """Name of a contact for the certificate.
+
+        :rtype: str or None"""
         return self._name
 
     @property
     def phone(self) -> Optional[str]:
-        """:rtype: str or None"""
+        """Phone number of a contact for the certificate.
+
+        :rtype: str or None"""
         return self._phone