zip: improve readability of package comment

Avoid using leading spaces in the bullet list, so that
those lines aren't interpreted as code blocks.

Use '•' instead of '-' as bullet point for aesthetic reasons.

Change-Id: I78edb7978c7e4488f0448303bc4b030140cbff34
Reviewed-on: https://go-review.googlesource.com/c/mod/+/204741
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
1 file changed