az-logout: add page

pages/common/az-logout.md

@@ -0,0 +1,12 @@
+# az logout
+
+> Logout from an Azure subscriptions.
+> More information: <https://docs.microsoft.com/cli/azure/reference-index#az_logout>.
+
+- Logout from the active account:
+
+`az logout`
+
+- Logout a specific username:
+
+`az logout --username {{[email protected]}}`