In '--health <lang>', print expected cmd when missing in $PATH

[helmesjo]

I tried looking through the issues but couldn't find any mention, but basically a small but useful enhancement would be to actually list what executable/cmd helix expects when it says "Not found in $PATH".

So here:

$ hx --health cpp
Configured language server: clangd
Binary for language server: /usr/bin/clangd
Configured debug adapter: lldb-vscode
Binary for debug adapter: Not found in $PATH
Highlight queries: ✓
Textobject queries: ✓
Indent queries: ✓

It would be very neat if it instead said:
Binary for debug adapter: 'lldb-vscode' not found in $PATH

By instead doing the full hx --health one can figure it out, but I guess there is no reason it couldn't be mentioned in both.