Create a function to display HTML/data based on site admins role?

I think below line of code is unnecessary, which is wrong if you looking for logged in user result. 

if( ! is_user_logged_in() )

Please use below code, I make some changes for solution.

//Add a hook for a shortcode 'add_my_form' tag...
add_shortcode( 'add_my_form', 'get_form_on_role' );

//Create sortcode API used function...
function get_form_on_role() {
    if(is_user_logged_in() ) {//If user is logged in...

        //Get current user role information...
        $user = new WP_User( get_current_user_id() );
        $roles = $user->roles;

        $returnTxt="";//Initialize return text variable...

        if( $roles[0] == 'pro_user' ) {//If user having 'pro_user' role...
            $returnTxt="HTML type 1";
        }elseif( $roles[0] == 'administrator' ) {//If user having 'administrator' role...
            $returnTxt="HTML type 2";
        }
        return $returnTxt;
    }
}


/*
    This will display 'HTML type 1' is user logged in with 'pro_user' role, 
    If logged in user with 'administrator' then it will print 'HTML type 2'...
*/
//You can use sortcode by API like... 
<?php echo do_shortcode("[add_my_form]");?>

Reference: Shortcode_API

Let me know if there is any doubt/query regarding this.

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