docs: add license note for interactive debugger

[sfsholden]

What does this PR do?

Updates the Interactive Debugger documentation with additional information about licenses provided to LMOs. The default license provided to LMOs can only be used with the ISV Debugger to debug a Subscriber org.

What issues does this PR fix or reference?

#2737, @W-8493955@

[codecov]

Codecov Report

Merging #2760 (b879d45) into develop (98f3e5e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
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  Coverage    76.25%   76.25%           
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  Files          271      271           
  Lines        10273    10273           
  Branches      1176     1176           
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  Hits          7834     7834           
  Misses        2105     2105           
  Partials       334      334           

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[ekapner]

Looks good. If people don't understand they need to purchase Apex Debugger licenses and this note causes confusion, we can update it to be more explicit. Or point to that Knowledge Article that explains more.

[supert3d]

Question. So how do I buy additional Debugger Licenses that I can use on Scratch Org's born from my Dev Hub?