Added kubectl completion command for fish shell in kubect cheatsheet docmentation

Signed-off-by: utkarsh-singh1 <[email protected]>

Author: utkarsh-singh1

content/en/docs/reference/kubectl/cheatsheet.md

@@ -39,6 +39,13 @@ complete -o default -F __start_kubectl k
 source <(kubectl completion zsh)  # set up autocomplete in zsh into the current shell
 echo '[[ $commands[kubectl] ]] && source <(kubectl completion zsh)' >> ~/.zshrc # add autocomplete permanently to your zsh shell
 ```
+
+### FISH
+
+```bash
+kubectl completion fish | source  # add it to your fish configuration file to setup autocomplete in your fish shell 
+```
+
 ### A note on `--all-namespaces`
 
 Appending `--all-namespaces` happens frequently enough that you should be aware of the shorthand for `--all-namespaces`: