[css-ruby] Remove unneeded bikeshed directive

Author: frivoal

css-ruby-1/Overview.bs

@@ -15,7 +15,6 @@ Editor: Xidorn Quan, Mozilla https://www.mozilla.org/, https://www.upsuper.org/,
 Abstract: “Ruby”, a form of interlinear annotation, are short runs of text alongside the base text.
 Abstract: They are typically used in East Asian documents to indicate pronunciation or to provide a short annotation.
 Abstract: This module describes the rendering model and formatting controls related to displaying ruby annotations in CSS.
-Ignored terms: internal table elements
 Ignored vars: any
 </pre>