Docs: update and polish kubernetes-app and monitoring examples

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

examples/kubernetes-app/testdata/mychart/templates/serviceaccount.yaml

@@ -0,0 +1,12 @@
+{{- if .Values.serviceAccount.create -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ include "mychart.serviceAccountName" . }}
+  labels:
+    {{- include "mychart.labels" . | nindent 4 }}
+  {{- with .Values.serviceAccount.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end -}}