Update DG

[ruishanteo]

• Removed unneeded prerequisites from manual testing
• Edit edit-t name (so that manual testing can be done sequentially)
• Add info box about lifeline for add-t
• Update planned enhancements
• Add design rationale for mark

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[codecov]

Codecov Report

Merging #333 (ed5e038) into master (27bcb7b) will increase coverage by 0.05%.
Report is 11 commits behind head on master.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #333      +/-   ##
============================================
+ Coverage     77.11%   77.16%   +0.05%     
+ Complexity      724      723       -1     
============================================
  Files           106      106              
  Lines          2189     2181       -8     
  Branches        231      229       -2     
============================================
- Hits           1688     1683       -5     
+ Misses          480      477       -3     
  Partials         21       21              

see 3 files with indirect coverage changes

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[mfjkri]

LGTM!

[mfjkri]

Thanks!! I think we are done?!!!