Incorrect Sample Font for Traditional Chinese

[skylee03]

The sample text for Traditional Chinese is not shown in IBM Plex Sans TC but a fallback font.
This is probably due to a typo in the following PR:

• Plex Traditional Chinese on Typeface page #1367.

While .#{$prefix}--type-chinese was added to the SCSS file, the class name for the sample text was set to ${prefix}--type-mono.

Replace the class name bx--type-mono with bx--type-chinese could fix this issue.

• Before
  

• After