Update the data-blocks vignette

[MikeJohnPage]

Updates:

• Removed comment about constructor function which is no longer relevant
• Update grammar / language throughout

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.80%. Comparing base (de313ed) to head (4d1c5da).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #397   +/-   ##
=======================================
  Coverage   84.80%   84.80%           
=======================================
  Files          21       21           
  Lines        2159     2159           
=======================================
  Hits         1831     1831           
  Misses        328      328           

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[DivadNojnarg]

Thanks @MikeJohnPage