python3-Sphinx: fix license

Author: meator

srcpkgs/python3-Sphinx/template

@@ -16,7 +16,7 @@ checkdepends="$depends python3-html5lib python3-mypy ImageMagick gettext
  graphviz"
 short_desc="Python 3 documentation generator"
 maintainer="Đoàn Trần Công Danh <congdanhqx@gmail.com>"
-license="BSD-3-Clause"
+license="BSD-2-Clause"
 homepage="http://sphinx-doc.org"
 changelog="https://github.com/sphinx-doc/sphinx/raw/master/CHANGES"
 distfiles="${PYPI_SITE}/s/sphinx/sphinx-${version}.tar.gz"