chore: tidy up index.html (#126)

Co-authored-by: darktears <[email protected]>

index.html

@@ -359,10 +359,10 @@ <h2>
       <p>
         Every instance of {{Document}} has an internal slot
         {{Document/[[CurrentPosture]]}}, which should be initialized when the
-        {{Document}} is created, otherwise they MUST be initialized the
-        first time they are accessed and before their value is read. The
-        <a>user agent</a> MUST run the <a>device posture change steps</a> with
-        the {{Document}} and true to initialize it.
+        {{Document}} is created, otherwise they MUST be initialized the first
+        time they are accessed and before their value is read. The <a>user
+        agent</a> MUST run the <a>device posture change steps</a> with the
+        {{Document}} and true to initialize it.
       </p>
       <p>
         For a given {{Document}}, the <a>current posture</a> is derived from
@@ -581,9 +581,9 @@ <h4>
             Focused Area
           </h4>
           <p>
-            Posture value readings are only available for each [=navigable/active document=]
-            whose origin is the same origin-domain with the currently focused
-            area {{Document}}.
+            Posture value readings are only available for each
+            [=navigable/active document=] whose origin is the same
+            origin-domain with the currently focused area {{Document}}.
           </p>
           <p>
             This is done in order to mitigate the risk of a skimming attack
@@ -597,11 +597,11 @@ <h4>
             Visibility State
           </h4>
           <p>
-            Posture value change events are only fired for each [=navigable/active document=]
-            whose [=Document/visibility state=] is "visible", and polling the
-            value while that is not the case, will return a stale value as the
-            value is only updated while the visibility state is "visible" or
-            just changed to "visible".
+            Posture value change events are only fired for each
+            [=navigable/active document=] whose [=Document/visibility state=]
+            is "visible", and polling the value while that is not the case,
+            will return a stale value as the value is only updated while the
+            visibility state is "visible" or just changed to "visible".
           </p>
         </section>
       </section>