All usages of display CSS utilities have been updated to reflect their
new names. Here's a summary of those updates:

- gl-display-sm-none -> gl-sm-display-none
- gl-display-md-none -> gl-md-display-none
- gl-display-lg-none -> gl-lg-display-none
- gl-display-sm-flex -> gl-sm-display-flex
- gl-display-md-flex -> gl-md-display-flex
- gl-display-lg-flex -> gl-lg-display-flex
- gl-display-sm-inline-flex -> gl-sm-display-inline-flex
- gl-display-lg-inline-flex -> gl-lg-display-inline-flex
- gl-display-sm-block -> gl-sm-display-block
- gl-display-md-block -> gl-md-display-block
- gl-display-lg-block -> gl-lg-display-block
- gl-display-lg-inline-block -> gl-lg-display-inline-block
- gl-display-lg-table-cell -> gl-lg-display-table-cell