Proposed update for font names for clarity
Proposed update for font names for clarity

I keep forgetting what order to put arguments in, and have to check the gifs against sources to find an obvious change.

This is because the args this asks for are `font_a` and `font_b`, and there are two logical interpretations of this:
1. I want to compare a font _before_ & _after_, so surely `font_a` is "before" and `font_b` is "after"
2. "Before" starts with a "b" and "After" starts with an "a," so surely `font_a` is "after" and `font_b` is "before" (based on a test just now, this is the actual answer)

Is there some even-more obvious answer here, like requiring explicit flags (`--before` and `--after`), or might this doc update be enough to make things obvious for users?
googlefonts/fontdiffenator,googlefonts/fontdiffenator