Fix circular definition

Signed-off-by: Euclid Ye <euclid.ye@huawei.com>

Author: yezhizhen

index.html

@@ -4575,13 +4575,12 @@ <h3>Interactability</h3>
  is a [^body^] element,
  or is the <a>document element</a>.
 
-<p>An <a>element</a>&apos;s <dfn data-lt="center point">in-view center point</dfn>
+<p>An <a>element</a>&apos;s <dfn data-lt="center point">center point</dfn>
  is the origin position of the rectangle
  that is the intersection between
  the element&apos;s first {{DOMRect}} of {{Element/getClientRects()}}
  and the <a>initial viewport</a>.
- Given an <a>element</a> that is known to be <a>in view</a>,
- it can be calculated this way:
+ It can be calculated this way:
 
 <ol>
  <li><p>Let <var>rectangle</var> be