New review comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/pull/27971#discussion_r559163653

Comment:
Revision is voids internal number to bump the package if a rebuild is required, i.e. because a dependency is updated.
This revision (`3`) is part of the version number, i.e use something like:

```
version=1.6p3
wrksrc="${pkgname}-${version/p/-}"
distfiles="https://github.com/mortie/${pkgname}/archive/v${version/p/-}.tar.gz"
```