.show-on-medium-and-up vs .hide-on-med-and-up

[warrenspe]

Before submitting...

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Context

The phrasing used for the helper classes should be aligned; ie med vs medium. For backwards compatibility the framework should probably define both, but point users to one or the other in the documentation

https://materializeweb.com/helpers.html#hiding

Current Behavior

No response

Expected behavior

No response

Possible Solutions or Causes

No response

Your Environment

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[wuda-io]

Yes that sounds good! A PR is very welcome.