fix short_description field in glossary files (#13045)

content/en/docs/reference/glossary/pod-disruption-budget.md

@@ -3,7 +3,7 @@ id: pod-disruption-budget
 title: Pod Disruption Budget
 full-link: /docs/concepts/workloads/pods/disruptions/
 date: 2019-02-12
-short-description: >
+short_description: >
  An object that limits the number of {{< glossary_tooltip text="Pods" term_id="pod" >}} of a replicated application, that are down simultaneously from voluntary disruptions.
 
 aka:

content/en/docs/reference/glossary/pod-lifecycle.md

@@ -8,7 +8,7 @@ related:
  - container
 tags:
  - fundamental
-short-description: >
+short_description: >
  A high-level summary of what phase the Pod is in within its lifecyle.
  
 ---

layouts/shortcodes/glossary_definition.html

@@ -13,7 +13,7 @@
 	{{- with .Summary -}}
 	{{- if $prepend }}{{- replace . "<p>" (printf "<P>%s %s" $prepend .) -}}{{ else }}{{- . -}}{{ end -}}
 	{{- else -}}
-	{{- partial "templates/errorthrower.html" (dict "block" "summary" "purpose" .purpose "describes the key term in greater depth, supplementing the short-description") . -}}
+	{{- partial "templates/errorthrower.html" (dict "block" "summary" "purpose" .purpose "describes the key term in greater depth, supplementing the short_description") . -}}
 	{{- end -}}
 {{- end -}}
 {{- if (strings.Contains "all|long" $length) -}}