Update kubectl-overview.md (#4990)

* Update kubectl-overview.md

The first letter of "where" should be capital, and some lost "." should be added.

* Update kubectl-overview.md

* Update kubectl-overview.md

docs/user-guide/kubectl-overview.md

@@ -27,9 +27,9 @@ where `command`, `TYPE`, `NAME`, and `flags` are:
 
    When performing an operation on multiple resources, you can specify each resource by type and name or specify one or more files:
    * To specify resources by type and name:
-        * To group resources if they are all the same type: `TYPE1 name1 name2 name<#>`<br/>
+        * To group resources if they are all the same type: `TYPE1 name1 name2 name<#>`<br/>.
         Example: `$ kubectl get pod example-pod1 example-pod2`
-        * To specify multiple resource types individually: `TYPE1/name1 TYPE1/name2 TYPE2/name3 TYPE<#>/name<#>`<br/>
+        * To specify multiple resource types individually: `TYPE1/name1 TYPE1/name2 TYPE2/name3 TYPE<#>/name<#>`<br/>.
         Example: `$ kubectl get pod/example-pod1 replicationcontroller/example-rc1`
    * To specify resources with one or more files: `-f file1 -f file2 -f file<#>`
      [Use YAML rather than JSON](/docs/concepts/configuration/overview/#general-config-tips) since YAML tends to be more user-friendly, especially for configuration files.<br/>