[css-text-3] Adjust some wording wrt bidirectionality and line boxes w3c#5759

Author: fantasai

css-text-3/Overview.bs

@@ -5724,16 +5724,16 @@ Bidirectionality and Line Boxes</h3>
 
   <p>The <a spec=css-writing-modes-3>start</a> and <a spec=css-writing-modes-3>end</a> sides of a line box
     are determined by the <a>inline base direction</a> of the line box.
-
-  <p class="note">Note: Although they usually match,
+    Although they usually match,
     the [=inline base direction=] of a [=line box=]
-    is distinct from the [=inline base direction=] applied to its contents.
+    is distinct from the [=inline base direction=]
+    of the [=containing block=] or the [=bidi paragraph=].
     The [=line box=]’s [=inline base direction=] affects
     'text-align-all', 'text-align-last', 'text-indent', and 'hanging-punctuation'--
     i.e. the position and alignment of its contents with respect to its edges.
-    It does not affect the formatting or ordering of inline content,
-    which is controlled by the Unicode bidirectional algorithm
-    as applied by [[CSS-WRITING-MODES-3]].
+    It does not affect the formatting or ordering of inline content
+    (which is controlled by the Unicode bidirectional algorithm
+    as applied by [[CSS-WRITING-MODES-3]]).
 
   <p>In most cases, a [=line box=]’s [=inline base direction=]
   is given by its [=containing block=]'s computed 'direction'.