Pie: Accessibility Only

`accTitle` and a multi-line `accDescr { … }` with no `title`: they become the SVG's `<title>`/`<desc>` and are never drawn as text.

pie-accessibility-only.mmd
pie
  accTitle: Survey answers
  accDescr {
    Most people answered yes.
    A few said no.
  }
  "Yes" : 70
  "No" : 30
Output
Pie chart, Zombie Mermaid Most people answered yes. A few said no. 70% 30% Yes No

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