Fixes typos/grammar in README.md

[rediris]

Summary of corrections:

• easer > easier
• adds apostrophe to users to denote possession
• removes apostrophes from in aria-label examples, as pluralization of nouns doesn't require them
• removes double b from aria-labbeledby
• adds space between use and role="status"
• adds a that for grammatical correction
• removes apostrophe from Let's to change meaning to Lets (as in allows) instead of a contraction of "Let Us"

I double checked my reasoning at https://www.grammarly.com/blog/apostrophe/

[markteekman]

Thanks @rediris for these great additions to the grammar of the readme 😊