Amend UserGuide

[shurvirarora]

Fixes #146
Fixes #147

[codecov]

Codecov Report

Merging #156 (0568c82) into master (0e76c8a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #156   +/-   ##
=========================================
  Coverage     76.78%   76.78%           
  Complexity      577      577           
=========================================
  Files            92       92           
  Lines          1680     1680           
  Branches        170      170           
=========================================
  Hits           1290     1290           
  Misses          340      340           
  Partials         50       50           

Impacted Files	Coverage Δ
.../java/seedu/address/logic/commands/TagCommand.java	100.00% <ø> (ø)

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[SimJM]

lgtm