Remove Helm monospace style

Author: zach-carr

source/release-notes.txt

@@ -37,9 +37,9 @@ MongoDB Resource Changes
 Kubernetes Operator Changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-- Supports ``helm`` :ref:`installation <install-k8s>` with 
+- Supports Helm :ref:`installation <install-k8s>` with 
   ``helm install`` in addition to ``helm template | kubectl apply``.
-  ``helm install`` is now the recommended way to install with ``helm``.
+  ``helm install`` is now the recommended way to install with Helm.
 
 - Supports configuring the MongoDB Agent authentication mechanism 
   independently from the cluster authentication mechanism.