Remove completion from help command.

Author: marc0der

src/main/bash/sdkman-help.sh

@@ -26,7 +26,6 @@ function __sdk_help() {
 	__sdkman_echo_no_colour "       uninstall or rm   <candidate> <version>"
 	__sdkman_echo_no_colour "       list      or ls   [candidate]"
 	__sdkman_echo_no_colour "       use       or u    <candidate> <version>"
-	__sdkman_echo_no_colour "       completion        <bash|zsh>"
 	__sdkman_echo_no_colour "       config"
 	__sdkman_echo_no_colour "       default   or d    <candidate> [version]"
 	__sdkman_echo_no_colour "       home      or h    <candidate> <version>"