Update usage.mdx (#4345)

* Update usage.mdx

Updated content as outlined in this issue:
#4234

* Update src/pages/components/modal/usage.mdx

Fixing my overzealous application of IBM Style :)

Co-authored-by: Anna Gonzales <[email protected]>

* Update src/pages/components/modal/usage.mdx

Co-authored-by: Anna Gonzales <[email protected]>

* Update src/pages/components/modal/usage.mdx

Co-authored-by: Anna Gonzales <[email protected]>

* Update usage.mdx

Addressing comments from the pull request.

* chore: format

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Co-authored-by: Anna Gonzales <[email protected]>
Co-authored-by: emyarod <[email protected]>