Copyright for mathjax-docs source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: mathjax-docs
Source: https://github.com/mathjax/mathjax-docs

Files: *
Copyright: 2009-2015 The MathJax Consortium
License: Apache-2.0

Files: debian/*
Copyright: 2012-2015 Dmitry Shachnev 
License: Apache-2.0

License: Apache-2.0
   Licensed under the Apache License, Version 2.0 (the "License");
   You may obtain a copy of the License at
   .
       http://www.apache.org/licenses/LICENSE-2.0
   .
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
   .
   On Debian systems, the complete text of the Apache version 2.0 license
   can be found in "/usr/share/common-licenses/Apache-2.0".