auto-completion

Signed-off-by: Qiannan Lyu <lvqiannan@gmail.com>

tools/pd-ctl/pdctl/command/completion_command.go

@@ -33,9 +33,8 @@ the .bash_profile.
 	    brew install bash-completion
 	## or, if running Bash 4.1+
 	    brew install bash-completion@2
-	## If tkctl is installed via homebrew, this should start working immediately.
 	## If you've installed via other means, you may need add the completion to your completion directory
-	    tkctl completion bash > $(brew --prefix)/etc/bash_completion.d/tkctl
+	    pd-ctl completion bash > $(brew --prefix)/etc/bash_completion.d/pd-ctl
 
 
 	# Installing bash completion on Linux