Update kubectl run from docs where necessary

kubectl run starting from 1.18 is creating only Pods and there is no option to
create any other resource. Users should be using kubectl create
commands instead. This update the documentation in all those places
where kubectl create should be used instead or changes description to
reflect the situation.

content/en/docs/concepts/services-networking/add-entries-to-pod-etc-hosts-with-host-aliases.md

@@ -23,7 +23,7 @@ Modification not using HostAliases is not suggested because the file is managed
 Start an Nginx Pod which is assigned a Pod IP:
 
 ```shell
-kubectl run nginx --image nginx --generator=run-pod/v1
+kubectl run nginx --image nginx
 ```
 
 ```
@@ -64,7 +64,7 @@ By default, the `hosts` file only includes IPv4 and IPv6 boilerplates like
 ## Adding additional entries with hostAliases
 
 In addition to the default boilerplate, you can add additional entries to the
-`hosts` file.  
+`hosts` file.
 For example: to resolve `foo.local`, `bar.local` to `127.0.0.1` and `foo.remote`,
 `bar.remote` to `10.1.2.3`, you can configure HostAliases for a Pod under
 `.spec.hostAliases`: