[css-text-3] Remove stray reference to %age word-spacing #5818

Author: frivoal

css-text-3/Overview.bs

@@ -27,7 +27,6 @@ At Risk: the ''full-width'' value of 'text-transform'
 At Risk: the ''full-size-kana'' value of 'text-transform'
 At Risk: the <length> values of the 'tab-size' property
 At Risk: the 'text-justify' property
-At Risk: the percentage values of 'word-spacing'
 At Risk: the 'hanging-punctuation' property
 At Risk: Writing-system specific adjustments to line-breaking
 At Risk: Trimming trailing Ogham space marks