Deleted duplicate sentence and corrected typo (#17902)

* Corrected the typo of 'chck' with 'check'

* Removed the duplicate sentence

content/en/docs/tasks/extend-kubectl/kubectl-plugins.md

@@ -168,7 +168,7 @@ sudo chmod +x ./kubectl-foo-bar-baz
 # "install" your plugin by moving it to a directory in your $PATH
 sudo mv ./kubectl-foo-bar-baz /usr/local/bin
 
-# chck that kubectl recognizes your plugin
+# check that kubectl recognizes your plugin
 kubectl plugin list
 ```