Bug in grammar for paths

Hi,

I have noticed that grammar for SVG path which is part of both SVG2 and
SVG1.1:

https://www.w3.org/TR/SVG2/paths.html#PathDataBNF
https://www.w3.org/TR/SVG11/paths.html#PathDataBNF

contains several identical errors. In many cases comma-wsp rule is
referenced as optional, for example in the following production rule:

coordinate-pair:
    coordinate comma-wsp? coordinate

However comma-wsp must be mandatory here otherwise it wouldn't be
possible to recognize pair of coordinates from the single number. Rule
should read as:

coordinate-pair:
    coordinate comma-wsp coordinate

There are other similar errors, for example in all rules named *-sequence.

Hope this helps,

   Jirka

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