Update index.html

Co-authored-by: Fuqiao Xue <xfq@w3.org>

index.html

@@ -237,7 +237,7 @@ <h2><a href="#faq">FAQ</a></h2>
 <dd><ul><li>A: Not really</li></ul></dd>
 
 <dt>Q: Is it possible to make too many requests for review?</dt>
-<dd><ul><li> A: Yes.  To help the review groups, only request updated reviews when substantive changea have been made, and clearly identify the changes since the last review.</li>
+<dd><ul><li> A: Yes.  To help the review groups, only request updated reviews when substantive changes have been made, and clearly identify the changes since the last review.</li>
 <li> A: This is also the reason that the Process clearly suggests there should be (TR) Working Drafts published when there are "significant changes that would benefit from review beyond the Working Group", rather than every day or only twice in the life of a spec…</li>
 <li> A: TR Working Drafts are also useful for reviews since they provide a dated snapshot which can be recovered when the review comments are being discussed. Trying to discuss review comments against a document which has changed out of all recognition can be a frustrating and inefficient experience.</li></ul></dd>
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