lib: add comment to script eval _tickCallback

Add a comment to match lib/module.js, missed in nodejs#11958.

PR-URL: nodejs/node#12050
Ref: nodejs/node#11958
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Yuta Hiroto <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: Richard Lau <[email protected]>

Author: gibfahn

lib/internal/bootstrap_node.js

@@ -353,6 +353,7 @@
                    `${JSON.stringify(name)}, displayErrors: true });\n`;
     const result = module._compile(script, `${name}-wrapper`);
     if (process._print_eval) console.log(result);
+    // Handle any nextTicks added in the first tick of the program.
     process._tickCallback();
   }