Update DG and UG

[chonguschonguschongus]

Update UML diagrams for Model as well as make changes to parts of the UG.

Find Blood Type no longer exists.

[codecov]

Codecov Report

Merging #245 (fcc8078) into master (a600608) will decrease coverage by 0.16%.
Report is 6 commits behind head on master.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #245      +/-   ##
============================================
- Coverage     79.87%   79.72%   -0.16%     
+ Complexity      790      781       -9     
============================================
  Files           111      110       -1     
  Lines          2519     2500      -19     
  Branches        269      266       -3     
============================================
- Hits           2012     1993      -19     
  Misses          419      419              
  Partials         88       88              

Files	Coverage Δ
...address/logic/commands/FindAppointmentCommand.java	100.00% <ø> (ø)
...s/logic/parser/DeleteAppointmentCommandParser.java	100.00% <ø> (ø)
...ess/logic/parser/FindAppointmentCommandParser.java	91.66% <ø> (ø)
...java/seedu/address/logic/parser/KeywordParser.java	90.90% <ø> (-2.85%)	⬇️
...du/address/model/person/UniqueAppointmentList.java	94.59% <ø> (ø)
...a/seedu/address/model/person/UniqueDoctorList.java	100.00% <ø> (ø)
...a/seedu/address/model/person/UniqueObjectList.java	53.84% <ø> (ø)
.../seedu/address/model/person/UniquePatientList.java	100.00% <ø> (ø)

📣 Codecov offers a browser extension for seamless coverage viewing on GitHub. Try it in Chrome or Firefox today!

[kohkaijie]

LGTM! Awesome detailed UML diagrams!

[cmHuang777]

LGTM!

[cmHuang777]

Should it be '*' Appointment instead? just like Tag