Where is the mruby debugger `mrdb`

[John Bampton]

Following the guide here: https://github.com/mruby/mruby/blob/master/doc/guides/debugger.md

The document says: "By default, the make command will install the debugger files into mruby/bin."

The mruby/bin folder is shown after running 'make' from the repo root:

I see we have a mrbgems/mruby-bin-debugger folder.