docs(ct): fix small typo in CONTRIBUTING.md

[jsvisa]

Description

Currently our contributing.md contains some typo issue:

The first two should be indented, not align with the list, the third one missing ., then caused the following line directly at the end of this line, no \r\n

Tests

Additional context

Metadata

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.14%. Comparing base (fb62380) to head (02d4c28).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12393      +/-   ##
===========================================
- Coverage    64.32%   64.14%   -0.19%     
===========================================
  Files           52       52              
  Lines         4348     4348              
===========================================
- Hits          2797     2789       -8     
- Misses        1376     1385       +9     
+ Partials       175      174       -1     

Flag	Coverage Δ
cannon-go-tests	64.14% <ø> (-0.19%)	⬇️

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see 1 file with indirect coverage changes

[jsvisa]

@smartcontracts could you please take a look at this one, thanks.