Change rustdoc docs to only compile+run in release mode

[victorb]

As-is, it asks the user to do a release mode build first, then after creating the directories, then do a debug mode build + run.

This commit simplifies it and avoids compiling the tracker in both debug and release mode, and instead only compiles+run with release mode

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.45%. Comparing base (326e577) to head (a460116).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1431      +/-   ##
===========================================
- Coverage    83.47%   83.45%   -0.03%     
===========================================
  Files          234      234              
  Lines        17316    17197     -119     
  Branches     17316    17197     -119     
===========================================
- Hits         14454    14351     -103     
  Misses        2590     2590              
+ Partials       272      256      -16     

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[josecelano]

ACK a460116