Remove duplicate paragraph in host_challenge.md

[poju3185]

[codecov-commenter]

Codecov Report

Merging #4302 (31d8a58) into master (96968d6) will decrease coverage by 3.63%. Report is 1101 commits behind head on master. The diff coverage is n/a.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4302      +/-   ##
==========================================
- 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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