[css-inline-3] Editorial tweaks to drop-cap intro

Author: fantasai

css-inline-3/Overview.bs

@@ -324,6 +324,8 @@ Drop Initial</h4>
 	depends on the alignment of its glyph.
 	Reference points on the drop cap must align precisely
 	with reference points in the text.
+	The alignment constraints for drop initials depend on the writing system.
+
 	In Western scripts, the top reference points are
 	the cap height of the initial letter and of the first line of text.
 	The bottom reference points are
@@ -337,19 +339,18 @@ Drop Initial</h4>
 		<figcaption>Two-line drop cap showing baselines (green lines), cap-height (red line), and ascender (cyan line).</figcaption>
 	</figure>
 
-	The alignment constraints for drop initials depend on the writing system.
-	In ideographic scripts, the initial letter extends
-	from the <a>block-start</a> edge of the first line
-	to the <a>block-end</a> edge of the Nth line.
+	In Han-derived scripts, the initial letter extends
+	from the <a>block-start</a> edge of the glyphs on the first line
+	to the <a>block-end</a> edge of the glyphs on the Nth line.
 
 	<figure>
 		<img src="images/Initial-2line-JapaneseVertical六.png" width="480"
 		     alt="Japanese Vertical Initial">
 		<figcaption>Two-line drop initial in vertical writing mode</figcaption>
 	</figure>
 
-	In some Indic scripts, the top alignment point
-	is the hanging baseline,
+	In certain Indic scripts,
+	the top alignment point	is the hanging baseline,
 	and the bottom alignment point is the text-after-edge.
 
 	<figure>