Update MathML to latest Version

14.6 <math:math> Replace the text The <math:math> element serves as a container for content defined by the MathML 2.0 standard. See [MathML] . with The <math:math> element serves as a container for content defined by the MathML standard, see [MathML] .   1.3 Normative References Replace the text [MathML] David Carlisle, Patrick Ion, Robert Miner, Nico Poppelier, Mathematical Markup Language (MathML) Version 2.0 (Second Edition), http://www.w3.org/TR/2003/REC-MathML2-20031021/ , W3C, 2003. with [MathML] David Carlisle, NAG , Patrick Ion, Mathematical Reviews, American Mathematical Society Robert Miner (deceased), Design Science, Inc. http://www.w3.org/TR/MathML , W3C   2.2.1 OpenDocument Document Replace the text B.4) If the XML root element of a file is <math:math>, then the XML file shall be valid with respect to the MathML 2.0 [MathML] schema. with B.4) If the XML root element of a file is <math:math>, then the XML file shall be valid with respect to the MathML [MathML] schema.