Automatically sort documented members by source order

[peizhenbai]

Description

Change doc config file and modify the default sorted method from alphabetical to source order.

Status

Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• In-line docstrings updated and documentation docs updated.

[codecov-io]

Codecov Report

Merging #88 (60be7bb) into master (7fd32df) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #88   +/-   ##
======================================
  Coverage    4.44%   4.44%           
======================================
  Files          36      36           
  Lines        2927    2927           
======================================
  Hits          130     130           
  Misses       2797    2797           

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[peizhenbai]

@haipinglu I find a new solution to automatically sort doc members by sorce order and do not need to modify rst files one by one. The Sphinx supports change default sort method by setting in conf file. Test on local and work well.