Fixed inaccessible links in several documents

[TranHuuNhatHuy]

Description

This pull request is to correct the inaccessible links in several documentations, mentioned in #439.

[codecov-commenter]

Codecov Report

Merging #437 (957cd4d) into develop (d40cad6) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #437      +/-   ##
===========================================
- Coverage    77.07%   77.01%   -0.06%     
===========================================
  Files          161      161              
  Lines        18640    18640              
===========================================
- Hits         14366    14356      -10     
- Misses        4274     4284      +10     

[anandxkumar]

Hi @TranHuuNhatHuy, you may want to pull the latest development branch in your repo and then run pre-commit install to add it to git hooks. pre-commit run --all-files before pushing code back or better use git commit -am "message" to run linting before committing the changes , if the test fails run the git commit -am "message" again to save the changes

[anandxkumar]

The test failed but for test and coverage, not related to your code. You may want to trigger Travis again by committing an empty commit i.e. git commit --allow-empty -am "Trigger"

[TranHuuNhatHuy]

Hello @anandxkumar. Thank you so much for helping me. I tried to commit an empty commit in order to trigger Travis again but somehow it doesn't respond. Should I wait for a while before retrying?

[anandxkumar]

Are you sure that you pushed the commit, because it is not showing here in the PR. Try git commit --allow-empty -m "Trigger".

[anandxkumar]

Tests passed, nice work!

[TranHuuNhatHuy]

@anandxkumar Thanks to your wholesome support !