Bug - Replace pf-u-screen-reader class in examples/components

[thatblindgeye]

Describe the problem
A clear and concise description of the problem. Which components are affected?
Related to patternfly/patternfly#5195

Currently some examples/components are using an element with class pf-u-screen-reader. These should be replaced with pf-screen-reader instead.

This would also apply to components using accessibleStyles.screenReader to apply a className.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.