Fix #3913: removing duplication in host_challenge doc

[Ru28]

fixed #3913

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.30%. Comparing base (96968d6) to head (ccdb096).
Report is 1128 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3917      +/-   ##
==========================================
- Coverage   72.93%   69.30%   -3.63%     
==========================================
  Files          83       20      -63     
  Lines        5368     3574    -1794     
==========================================
- Hits         3915     2477    -1438     
+ Misses       1453     1097     -356     

see 64 files with indirect coverage changes

see 64 files with indirect coverage changes

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[RishabhJain2018]

LGTM :)