Changing all incorrect headings of task 'list-all-running-container-images' (#19300)

* Correcting all headings

All tasks of this page list down container images and not container itself. so changing all headings to make it correct.

* Correcting case 

Correcting case

Author: Rajesh Deshpande

content/en/docs/tasks/access-application-cluster/list-all-running-container-images.md

@@ -23,7 +23,7 @@ In this exercise you will use kubectl to fetch all of the Pods
 running in a cluster, and format the output to pull out the list
 of Containers for each.
 
-## List all Containers in all namespaces
+## List all Container images in all namespaces
 
 - Fetch all Pods in all namespaces using `kubectl get pods --all-namespaces`
 - Format the output to include only the list of Container image names
@@ -68,7 +68,7 @@ the `.items[*]` portion of the path should be omitted because a single
 Pod is returned instead of a list of items.
 {{< /note >}}
 
-## List Containers by Pod
+## List Container images by Pod
 
 The formatting can be controlled further by using the `range` operation to
 iterate over elements individually.
@@ -78,7 +78,7 @@ kubectl get pods --all-namespaces -o=jsonpath='{range .items[*]}{"\n"}{.metadata
 sort
 ```
 
-## List Containers filtering by Pod label
+## List Container images filtering by Pod label
 
 To target only Pods matching a specific label, use the -l flag.  The
 following matches only Pods with labels matching `app=nginx`.
@@ -87,7 +87,7 @@ following matches only Pods with labels matching `app=nginx`.
 kubectl get pods --all-namespaces -o=jsonpath="{..image}" -l app=nginx
 ```
 
-## List Containers filtering by Pod namespace
+## List Container images filtering by Pod namespace
 
 To target only pods in a specific namespace, use the namespace flag. The
 following matches only Pods in the `kube-system` namespace.
@@ -96,7 +96,7 @@ following matches only Pods in the `kube-system` namespace.
 kubectl get pods --namespace kube-system -o jsonpath="{..image}"
 ```
 
-## List Containers using a go-template instead of jsonpath
+## List Container images using a go-template instead of jsonpath
 
 As an alternative to jsonpath, Kubectl supports using [go-templates](https://golang.org/pkg/text/template/)
 for formatting the output: