[css-inline-3] Improve abstract

Author: fantasai

css-inline-3/Overview.bs

@@ -22,7 +22,7 @@ Previous version: https://www.w3.org/TR/2002/WD-css3-linebox-20020515/
 Editor: Dave Cramer, Hachette Livre, dauwhe@gmail.com, w3cid 65283
 Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact, w3cid 35400
 Former Editor: Steve Zilles, Adobe, szilles@adobe.com, w3cid 3129
-Abstract: The CSS formatting model provides for a flow of elements and text inside of a container to be wrapped into lines.  The formatting of elements and text within a line, its positioning in the inline progression direction, and the breaking of lines are described in [[CSS-TEXT-3]].  This module describes the positioning in the block progression direction both of elements and text within lines and of the lines themselves.  This positioning is often relative to a baseline.  It also describes special features for formatting of first lines and drop caps.  It extends on the model in [[CSS2]].
+Abstract: The CSS formatting model provides for a flow of elements and text inside of a container to be wrapped into lines. This module describes box model for this inline layout model and defines the block-axis alignment and sizing of inline-level content, extending the model in [[CSS2]]. It also adds a special layout mode for drop-caps.
 Ignored Terms: line-height-shift-adjustment, text-script, after, before, alignment subtree
 Link Defaults: css-fonts-3 (property) font-family, css-color-3 (property) color
 At Risk: the 'initial-letter-wrap' property