make warning in infoblox service pydoc more explicit

gso/services/infoblox.py

@@ -73,8 +73,11 @@ def hostname_available(hostname: str) -> bool:
     """Check whether a hostname is still available **in Infoblox**.
 
     Check whether Infoblox already contains a :class:`infoblox_client.objects.HostRecord` that matches the given
-    hostname. Be aware that this method only checks within the Infoblox instance, and not the rest of the internet.
-    The hostname could therefore still be taken elsewhere.
+    hostname.
+
+    .. warning::
+       This method only checks within the Infoblox instance, and not the rest of the internet. The hostname could
+       therefore still be taken elsewhere.
 
     :param hostname: The hostname to be checked.
     :type hostname: str