Fixed typos in mbt stereo tutorial

[rolalaro]

[TUTO][CLEAN] Fixed typos in mbt stereo tutorial:

• wrong link at the end of the dox
• "the the"
• "of a combination" instead of "or a combination"
• wrong test when VISP_HAVE_MODULE_KLT is not defined

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.42%. Comparing base (983d558) to head (deea281).
Report is 106 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1461   +/-   ##
=======================================
  Coverage   45.42%   45.42%           
=======================================
  Files        1110     1110           
  Lines      110643   110643           
  Branches    18944    18944           
=======================================
  Hits        50264    50264           
  Misses      60379    60379           

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