minor fixes for feedback message and socmed parsing

[codecov[bot]]

Codecov Report

Merging #152 (e639ddf) into master (0270e5a) will decrease coverage by 0.03%. The diff coverage is 22.22%.

@@             Coverage Diff              @@
##             master     #152      +/-   ##
============================================
- Coverage     64.73%   64.71%   -0.03%     
- Complexity      671      674       +3     
============================================
  Files           101      101              
  Lines          2433     2440       +7     
  Branches        359      359              
============================================
+ Hits           1575     1579       +4     
- Misses          678      680       +2     
- Partials        180      181       +1     

Impacted Files	Coverage Δ
...onnectus/logic/commands/AddTagToPersonCommand.java	35.00% <ø> (ø)
.../java/seedu/connectus/logic/parser/ParserUtil.java	80.15% <0.00%> (ø)
...a/seedu/connectus/model/socialmedia/Instagram.java	57.14% <0.00%> (-7.15%)	:arrow_down:
...va/seedu/connectus/model/socialmedia/Telegram.java	57.14% <ø> (ø)
...ava/seedu/connectus/model/util/SampleDataUtil.java	15.58% <0.00%> (-0.86%)	:arrow_down:
...eedu/connectus/logic/parser/HelpCommandParser.java	100.00% <100.00%> (ø)
...va/seedu/connectus/model/socialmedia/WhatsApp.java	44.44% <100.00%> (ø)

... and 2 files with indirect coverage changes

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