clean up walk.ts

[pasha-bolokhov]

Correct the description of examples of usage of thematch and skip options

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.18%. Comparing base (13e5527) to head (366b774).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6918   +/-   ##
=======================================
  Coverage   94.17%   94.18%           
=======================================
  Files         584      584           
  Lines       43087    43087           
  Branches     6875     6875           
=======================================
+ Hits        40578    40581    +3     
+ Misses       2457     2455    -2     
+ Partials       52       51    -1     

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