fix(chvar): typo

[heheleo]

Just a minor typo.

An additional note, you can replace the #h(2em) notation with the keyword wide - although it is just syntactic sugar and is up to you.

[vEnhance]

Thanks much! I forget if you are already in the preface but if not let me know what name you prefer to go by and I can add you to the list of people who've helped report mistakes.

I think I'll leave the #h(1em) and #h(2em) for now, but might change those later if I'm in the mood.