Style changes to autodevops page

The autodevops page needed a few small stylistic changes; this
commit provides them. No technical information was changed in
this commit.

doc/topics/autodevops/index.md

@@ -742,15 +742,15 @@ workers:
 > [Introduced](https://gitlab.com/gitlab-org/charts/auto-deploy-app/-/merge_requests/30) in GitLab 12.7.
 
 By default, all Kubernetes pods are
-[non-isolated](https://kubernetes.io/docs/concepts/services-networking/network-policies/#isolated-and-non-isolated-pods)
+[non-isolated](https://kubernetes.io/docs/concepts/services-networking/network-policies/#isolated-and-non-isolated-pods),
 and accept traffic from any source. You can use
 [NetworkPolicy](https://kubernetes.io/docs/concepts/services-networking/network-policies/)
 to restrict connections to selected pods or namespaces.
 
 NOTE: **Note:**
 You must use a Kubernetes network plugin that implements support for
-`NetworkPolicy`, the default network plugin for Kubernetes (`kubenet`)
-[doesn't implement](https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/#kubenet)
+`NetworkPolicy`. The default network plugin for Kubernetes (`kubenet`)
+[does not implement](https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/#kubenet)
 support for it. The [Cilium](https://cilium.io/) network plugin can be
 installed as a [cluster application](../../user/clusters/applications.md#install-cilium-using-gitlab-ci)
 to enable support for network policies.
@@ -758,20 +758,20 @@ to enable support for network policies.
 You can enable deployment of a network policy by setting the following
 in the `.gitlab/auto-deploy-values.yaml` file:
 
-```yml
+```yaml
 networkPolicy:
   enabled: true
 ```
 
 The default policy deployed by the auto deploy pipeline will allow
 traffic within a local namespace and from the `gitlab-managed-apps`
-namespace, all other inbound connection will be blocked. Outbound
+namespace. All other inbound connection will be blocked. Outbound
 traffic is not affected by the default policy.
 
 You can also provide a custom [policy specification](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.16/#networkpolicyspec-v1-networking-k8s-io)
 via the `.gitlab/auto-deploy-values.yaml` file, for example:
 
-```yml
+```yaml
 networkPolicy:
   enabled: true
   spec: