WCAG upgrade -- add example for alignment

[shiva-sc]

No description provided.

[duboisp]

See the inline change request/proposal.

Beside the code, please add a little text description before, like how I did with the French translation proposal.

Missing:

• text-center

Please add mention for those two with a note saying they are demoed through the grid example

• align-self-center
• align-self-end
• align-items-center
• align-items-sm-center

Thanks

[duboisp]

A few additional change, just some little adjustment.

[duboisp]

Tested locally and reviewed the code. All work as expected.

It do contains all example related to the alignment which was identified in the accessibility project card.

I confirm this is only a content change