Since the variable $weight-extrabold exists, it makes sense to add .has-text-weight-extrabold as a typography class.
Updated examples and harmonised the css weight vs the description of semi-bold (semibold).
Noticed the text weight was all strong in the docs for each text weight. Instead I think it would be nice for folks to be able to see the difference in text weight.
* Added examples for each text transformation helper
* Updated typography to reflect the text weights in examples
* Added examples to each size helper
Co-authored-by: Whit Waldo <whit.waldo@innovian.net>