- [mixins] a bit better comments formatting for `misc` mixins
- [helpers] changed naming approach in spacing helpers #breaking; added `@param` description to mixin

Spacing helpers like `margin--top+` now should be written as `margin-top+`, since direction isn't modification, but name of the property, while `+` or `-` or `--flush` is actually modification of property
- [helpers] added `@param` description to `ekzo-widths()` mixin