main/lua5.1: set replaces=lua and replaces=lua-doc

main/lua5.1/APKBUILD

@@ -3,7 +3,7 @@ pkgname=lua5.1
 _pkgname=lua
 pkgver=5.1.5
 _luaver=${pkgname#lua}
-pkgrel=5
+pkgrel=6
 pkgdesc="A powerful light-weight programming language designed for extending applications."
 url="https://www.lua.org/"
 arch="all"
@@ -12,6 +12,7 @@ depends_dev="$pkgname"
 makedepends="libtool autoconf automake"
 provides="lua"
 provider_priority=100
+replaces="lua"  # for backward compatibility
 subpackages="$pkgname-dev $pkgname-doc $pkgname-libs"
 source="https://www.lua.org/ftp/lua-$pkgver.tar.gz
 	lua-5.1-make.patch
@@ -87,18 +88,19 @@ package() {
 dev() {
 	default_dev
 	provides="lua-dev"
-	replaces="lua-dev"
+	replaces="lua-dev"  # for backward compatibility
 }
 
 doc() {
 	default_doc
 	provides="lua-doc"
+	replaces="lua-doc"  # for backward compatibility
 }
 
 libs() {
 	pkgdesc="Lua dynamic library runtime"
 	provides="lua-libs"
-	replaces="lua lua-libs"
+	replaces="lua lua-libs"  # for backward compatibility
 
 	mkdir -p "$subpkgdir"/usr
 	mv "$pkgdir"/usr/lib "$subpkgdir"/usr/