[css-ruby] Define (and cross-link) "ruby columns"

Author: frivoal

css-ruby-1/Overview.bs

@@ -165,7 +165,7 @@ Ruby Box Model</h2>
 	associated with one or more levels of [=ruby annotation=] elements representing the annotations.
 	The structure of ruby is similar to that of a table:
 	there are “rows” (the [=base text level=], each [=annotation level=])
-	and “columns” (each [=ruby base=] and its corresponding [=ruby annotations=]).
+	and “[=columns=]” (each [=ruby base=] and its corresponding [=ruby annotations=]).
 
 	Consecutive bases and annotations are grouped together into [=ruby segments=].
 	Within a [=ruby segment=], a [=ruby annotation=] may span multiple [=ruby bases=].
@@ -440,7 +440,7 @@ Annotation Pairing</h3>
 	However, if there are multiple [=annotation levels=],
 	it can be associated with multiple [=ruby annotations=].
 
-	Once [=pairing=] is complete, ruby “column” units are defined,
+	Once [=pairing=] is complete, <dfn local-lt=column>ruby column</dfn> units are defined,
 	each represented by a single [=ruby base=]
 	and one [=ruby annotation=] (possibly an empty, anonymous one)
 	from each [=annotation level=] in its [=ruby segment=].
@@ -719,7 +719,7 @@ Ruby Layout</h2>
 	A [=ruby container=] (or fragment thereof)
 	measures as wide as the content of its widest level.
 	Similarly, [=ruby base boxes=] and [=ruby annotation boxes=]
-	within a ruby “column” have the measure of the widest content in that “column”.
+	within a [=ruby column=] have the measure of the widest content in that [=column=].
 	In the case of [=spanning annotations=]
 	(whether actually spanning or pretending to span per 'ruby-merge'),
 	the measures of the [=ruby annotation box=] and
@@ -1080,7 +1080,7 @@ Sharing Annotation Space: the 'ruby-merge' property</h3>
 	<dl dfn-for=ruby-merge dfn-type=value>
 		<dt><dfn>separate</dfn>
 		<dd>
-			Each ruby annotation box is rendered in the same column(s) as its corresponding base box(es).
+			Each ruby annotation box is rendered in the same [=column=](s) as its corresponding base box(es).
 			This style is called “mono ruby” in [[JLREQ]].
 
 			<div class="example">
@@ -1274,7 +1274,7 @@ Ruby Text Decoration</h3>
 
 	Issue: This section needs some clarification about
 	drawing decorations between the content of adjacent bases/annotations.
-	Depends on if those boxes are as wide as their column or not.
+	Depends on if those boxes are as wide as their [=column=] or not.
 
 <h2 id="edge-effects">
 Edge Effects</h2>