user/gtk-doc: update makedepends. fixes #988.

user/gtk-doc/APKBUILD

-# Maintainer: 
+# Maintainer: Zach van Rijn <me@zv.io>
 pkgname=gtk-doc
 pkgver=1.32
-pkgrel=0
+pkgrel=1
 pkgdesc="Documentation tool for public library API"
 url="https://www.gtk.org/gtk-doc/"
 arch="noarch"
@@ -11,7 +11,7 @@ options="!check"
 license="GFDL"
 depends="docbook-xsl perl python3 py3-pygments py3-six pkgconf glib-dev highlight"
 checkdepends="bc"
-makedepends="rarian-dev py-libxml2 itstool autoconf automake libtool"
+makedepends="rarian-dev py3-libxml2 itstool autoconf automake libtool"
 source="https://download.gnome.org/sources/$pkgname/$pkgver/$pkgname-$pkgver.tar.xz"
 
 build() {