Merge pull request #278 from w3c/zcorpan/fromPoint-must

[geometry] Add a missing "must"

Author: dirkschulze

geometry/Overview.bs

@@ -141,7 +141,7 @@ id=dom-dompointreadonly-frompoint><code>fromPoint(<var>other</var>)</code></dfn>
 
 <p>The <dfn method dfn-for=DOMPoint
 id=dom-dompoint-frompoint><code>fromPoint(<var>other</var>)</code></dfn> static method on
-{{DOMPoint}} <a>create a <code>DOMPoint</code> from the dictionary</a> <var>other</var>.
+{{DOMPoint}} must <a>create a <code>DOMPoint</code> from the dictionary</a> <var>other</var>.
 
 <p>To <dfn lt="create a DOMPointReadOnly from the dictionary">create a <code>DOMPointReadOnly</code>
 from a dictionary</dfn> <var>other</var>, or to <dfn lt="create a DOMPoint from the