Fix typos in metaclasses.py

[JulienBacquart]

JavaScriot -> JavaScript

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.98%. Comparing base (dafdd03) to head (1577cef).

Files	Patch %	Lines
highcharts_core/metaclasses.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #197   +/-   ##
=======================================
  Coverage   87.98%   87.98%           
=======================================
  Files         210      210           
  Lines       31155    31155           
  Branches     2549     2549           
=======================================
  Hits        27413    27413           
  Misses       2783     2783           
  Partials      959      959           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.