Minor changes to punctuation and code rendering for documentation.

[vprusso]

I noticed a few areas in the docs that weren't rendering code correctly and also fixing some minor punctuation/grammar in docs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.1%. Comparing base (6500384) to head (bfcf19b).

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #517   +/-   ##
======================================
  Coverage    98.1%   98.1%           
======================================
  Files         160     160           
  Lines        3090    3090           
  Branches      751     751           
======================================
  Hits         3032    3032           
  Misses         37      37           
  Partials       21      21           

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[vprusso]

Think we've seen the failures from https://github.com/vprusso/toqito/actions/runs/8409559471/job/23026997987?pr=517 before, right @purva-thakre ?

[purva-thakre]

Think we've seen the failures

Yup, there's an open issue for these. #473

The failing tests should pass if you re-run the workflow a couple of times.

[purva-thakre]

Thanks for catching these!