Update docs to explain tags can not process white spaces

[AdityaB4]

Fixes #82. @AY2324S2-CS2103T-W12-2/developers can someone help check whitespaces don't create unrecoverable states in the app.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.35%. Comparing base (4767dbf) to head (4de54c3).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
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  Coverage     64.35%   64.35%           
  Complexity      508      508           
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  Files            98       98           
  Lines          2003     2003           
  Branches        208      208           
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  Hits           1289     1289           
  Misses          630      630           
  Partials         84       84           

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[blaukc]

Fixes #82. @AY2324S2-CS2103T-W12-2/developers can someone help check whitespaces don't create unrecoverable states in the app.

what does unrecoverable states mean & how are they created

[yadunut]

As of now, tag names only support alphanumeric characters, so underscore doesn't work

[AdityaB4]

As of now, tag names only support alphanumeric characters, so underscore doesn't work

@yadunut would it be right to change this to just say whitespaces are not accepted then?

[yadunut]

I think if you change it to "You can use capitalization such as camelCasing" to distinguish different words in a tag and the no whitespaces part and then write a line in the glossary about camelCasing