[Doc][Stochastic Beam Search] Improve Documentation of Stochastic Beam Search in NMT

[XieBinghui]

Description

(Brief description on what this PR is about)

Checklist

Essentials

• [ ] PR's title starts with a category (e.g. [BUGFIX], [MODEL], [TUTORIAL], [FEATURE], [DOC], etc)
• [ ] Changes are complete (i.e. I finished coding on this PR)
• [ ] All changes have test coverage
• [ ] Code is well-documented

Changes

• [ ] Feature1, tests, (and when applicable, API doc)
• [ ] Feature2, tests, (and when applicable, API doc)

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

cc @dmlc/gluon-nlp-team

[codecov[bot]]

Codecov Report

Merging #1464 (cef08ef) into master (98325f5) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1464   +/-   ##
=======================================
  Coverage   85.84%   85.84%           
=======================================
  Files          52       52           
  Lines        6907     6907           
=======================================
  Hits         5929     5929           
  Misses        978      978           

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[github-actions[bot]]

The documentation website for preview: http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR1464/master/index.html

[github-actions[bot]]

The documentation website for preview: http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR1464/master/index.html

[github-actions[bot]]

The documentation website for preview: http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR1464/master/index.html

[sxjscience]

Thanks!