Update DG

[VaishakAnand]

• Added Attendance, Detail entries in to DG.
• Added respective diagrams.
• Edited editCommand diagram

[codecov-io]

Codecov Report

Merging #229 (a1387f1) into master (8a6d233) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #229      +/-   ##
============================================
+ Coverage     78.53%   78.56%   +0.03%     
  Complexity     1155     1155              
============================================
  Files           157      157              
  Lines          3503     3508       +5     
  Branches        407      407              
============================================
+ Hits           2751     2756       +5     
  Misses          611      611              
  Partials        141      141              

Impacted Files	Coverage Δ	Complexity Δ
...eedu/address/logic/commands/AttendanceCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...va/seedu/address/logic/commands/DetailCommand.java	100.00% <100.00%> (ø)	2.00 <1.00> (ø)

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