Update UG and PPP

[wpx12011]

Update UG and PPP

Fix some prompt message in txn-related commands (change reference from 'sales book' to 'transaction list')

[benedict733]

Need to update your documentation to pass checkstyle

[codecov]

Codecov Report

Merging #198 (eb7c7b4) into master (2c7e892) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #198   +/-   ##
=========================================
  Coverage     69.83%   69.83%           
  Complexity      759      759           
=========================================
  Files           130      130           
  Lines          2513     2513           
  Branches        312      312           
=========================================
  Hits           1755     1755           
  Misses          635      635           
  Partials        123      123           

Impacted Files	Coverage Δ
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <ø> (ø)
...a/seedu/address/logic/commands/AddTaskCommand.java	90.32% <ø> (ø)
...address/logic/commands/FindTxnByPersonCommand.java	54.54% <ø> (ø)
...s/logic/commands/txncommands/DeleteTxnCommand.java	0.00% <ø> (ø)
...ess/logic/commands/txncommands/EditTxnCommand.java	46.03% <ø> (ø)
...ess/logic/commands/txncommands/ListTxnCommand.java	100.00% <ø> (ø)
...ress/logic/commands/txncommands/AddTxnCommand.java	64.28% <100.00%> (ø)

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[benedict733]

LGTM, just need to merge conflicts and take note of lines in between sections