Minor Fixes from Dry Run

[rtshkmr]

Description

Involves the easier fixes from the Dry run.

Fixes #302 ➡️ displays "client" iff returns 1 result else return "clients".
Fixes #294 ➡️ reflects annotated diagram now.

Testing

NIL

Remarks

NIL

[codecov]

Codecov Report

Merging #336 into master will decrease coverage by 0.02%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master     #336      +/-   ##
============================================
- Coverage     88.37%   88.34%   -0.03%     
- Complexity      969      973       +4     
============================================
  Files           113      113              
  Lines          2529     2532       +3     
  Branches        288      289       +1     
============================================
+ Hits           2235     2237       +2     
+ Misses          208      207       -1     
- Partials         86       88       +2     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	33.33% <50.00%> (+33.33%)	4.00 <3.00> (+4.00)
...eedu/address/logic/commands/ClientFindCommand.java	100.00% <100.00%> (ø)	6.00 <0.00> (ø)

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