Fix #3913: removing duplication in host_challenge doc

[Ru28]

fixed #3913

[codecov-commenter]

Codecov Report

Merging #3917 (d3c3c5f) into master (96968d6) will decrease coverage by 1.92%. The diff coverage is 39.40%.

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@@            Coverage Diff             @@
##           master    #3917      +/-   ##
==========================================
- Coverage   72.93%   71.02%   -1.92%     
==========================================
  Files          83       20      -63     
  Lines        5368     3230    -2138     
==========================================
- Hits         3915     2294    -1621     
+ Misses       1453      936     -517     

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	:arrow_down:
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	:arrow_down:
frontend/src/js/controllers/challengeCtrl.js	63.10% <32.22%> (-10.60%)	:arrow_down:
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	:arrow_down:
frontend/src/js/controllers/profileCtrl.js	80.89% <45.45%> (-11.96%)	:arrow_down:
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	:arrow_down:
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/challengeListCtrl.js	93.54% <97.91%> (-1.14%)	:arrow_down:
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 5 more

... and 63 files with indirect coverage changes

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	:arrow_down:
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	:arrow_down:
frontend/src/js/controllers/challengeCtrl.js	63.10% <32.22%> (-10.60%)	:arrow_down:
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	:arrow_down:
frontend/src/js/controllers/profileCtrl.js	80.89% <45.45%> (-11.96%)	:arrow_down:
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	:arrow_down:
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/challengeListCtrl.js	93.54% <97.91%> (-1.14%)	:arrow_down:
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 5 more

... and 63 files with indirect coverage changes

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