Fix capitalization nit in patch 230218

Fixes the Neutron capitalization nit found by Paul Carver
in patch 230218 after it was in the gate.

Signed-off-by: Ryan Moats <rmoats@us.ibm.com>

Change-Id: I27481b70dbd313ba1fa54708d46db8b99a7e670d

doc/source/devref/effective_neutron.rst

@@ -109,7 +109,7 @@ Backward compatibility
 
 Document common pitfalls as well as good practices done when extending the RPC Interfaces.
 
-* The neutron upgrade path requires the server to support the previous version of
+* The Neutron upgrade path requires the server to support the previous version of
   the agent. Any changes to the existing RPC methods must be compatible with the
   previous version of the agent. Otherwise a version bump is required and the old
   method must be kept under the previous version RPC endpoint.