Update DG & UG for Find / Payments

[kokrui]

Closes #116

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8729e17) 82.78% compared to head (4a54914) 82.80%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #159      +/-   ##
============================================
+ Coverage     82.78%   82.80%   +0.02%     
+ Complexity      755      753       -2     
============================================
  Files            99       99              
  Lines          2312     2315       +3     
  Branches        259      258       -1     
============================================
+ Hits           1914     1917       +3     
  Misses          333      333              
  Partials         65       65              

Files	Coverage Δ
.../seedu/address/logic/parser/FindCommandParser.java	100.00% <100.00%> (ø)
...edu/address/logic/parser/FindExpressionParser.java	95.83% <100.00%> (-0.04%)	⬇️
...ddress/logic/parser/FindFilterStringTokenizer.java	96.66% <95.45%> (+0.23%)	⬆️

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[conradsoon]

• Markbind builds successfully
• Program runs
• Messing around with find generally works
• Regex makes sense to me
  LGTM