Fix/re-introduce custom Jekyll tags for better glossary integration (#6163)

docs/concepts/services-networking/ingress.md

@@ -5,7 +5,7 @@ title: Ingress
 ---
 
 {% capture overview %}
-{% include templates/glossary/snippet.md term="ingress" length="all" %}
+{% glossary_definition term_id="ingress" length="all" %}
 {% endcapture %}
 
 {% capture body %}

docs/concepts/workloads/controllers/statefulset.md

@@ -10,10 +10,10 @@ title: StatefulSets
 ---
 
 {% capture overview %}
-**StatefulSet is the workload API object used to manage stateful applications. 
+**StatefulSet is the workload API object used to manage stateful applications.
 StatefulSets are beta in 1.8.**
 
-{% include templates/glossary/snippet.md term="statefulset" length="all" %}
+{% glossary_definition term_id="statefulset" length="all" %}
 {% endcapture %}
 
 {% capture body %}