Update docs

Author: sayboras

Diff for: site/content/en/docs/commands/completion.md

@@ -13,7 +13,7 @@ Outputs minikube shell completion for the given shell (bash or zsh)
 ### Synopsis
 
 
-	Outputs minikube shell completion for the given shell (bash or zsh)
+	Outputs minikube shell completion for the given shell (bash, zsh or fish)
 
 	This depends on the bash-completion binary.  Example installation instructions:
 	OS X:
@@ -31,6 +31,7 @@ Outputs minikube shell completion for the given shell (bash or zsh)
 	Additionally, you may want to output the completion to a file and source in your .bashrc
 
 	Note for zsh users: [1] zsh completions are only supported in versions of zsh >= 5.2
+	Note for fish users: [2] please refer to this docs for more details https://fishshell.com/docs/current/#tab-completion
 
 
 ```