Fix #262: Not all align keywords are bidi-sensitive

index.bs

@@ -1695,8 +1695,8 @@ given:</p>
 </ol>
 
 <p class="note">A <a>WebVTT alignment cue setting</a> configures the alignment of the text within
-the cue. The keywords are relative to the cue text's lines' base direction; for left-to-right
-English text, "<code>start</code>" means left-aligned.</p>
+the cue. The "<code>start</code>" and "<code>end</code>" keywords are relative to the cue text's
+lines' base direction; for left-to-right English text, "<code>start</code>" means left-aligned.</p>
 
 <p>A <dfn>WebVTT region cue setting</dfn> consists of the following components, in the order
 given:</p>

index.html

@@ -2328,8 +2328,8 @@ <h3 class="heading settled" data-level="4.4" id="cue-settings"><span class="secn
  "<code>middle</code>", "<code>end</code>", "<code>left</code>", "<code>right</code>"
    </ol>
    <p class="note" role="note">A <a data-link-type="dfn" href="#webvtt-alignment-cue-setting">WebVTT alignment cue setting</a> configures the alignment of the text within
-the cue. The keywords are relative to the cue text’s lines' base direction; for left-to-right
-English text, "<code>start</code>" means left-aligned.</p>
+the cue. The "<code>start</code>" and "<code>end</code>" keywords are relative to the cue text’s
+lines' base direction; for left-to-right English text, "<code>start</code>" means left-aligned.</p>
    <p>A <dfn data-dfn-type="dfn" data-noexport="" id="webvtt-region-cue-setting">WebVTT region cue setting<a class="self-link" href="#webvtt-region-cue-setting"></a></dfn> consists of the following components, in the order
 given:</p>
    <ol>