Editorial: typo sIdentity → isIdentity

Author: zcorpan

geometry/Overview.bs

@@ -1192,7 +1192,7 @@ for=matrix>is2D</a> to <code>false</code>.
 <div dfn-type=attribute dfn-for=DOMMatrixReadOnly>
  <p>The <dfn><code>is2D</code></dfn> attribute must return the value of <a for=matrix>is2D</a>.
 
- <p>The <dfn><code>sIdentity</code></dfn> attribute must return <code>true</code> if
+ <p>The <dfn><code>isIdentity</code></dfn> attribute must return <code>true</code> if
  {{DOMMatrixReadOnly/m12}}, {{DOMMatrixReadOnly/m13}}, {{DOMMatrixReadOnly/m14}},
  {{DOMMatrixReadOnly/m21}}, {{DOMMatrixReadOnly/m23}}, {{DOMMatrixReadOnly/m24}},
  {{DOMMatrixReadOnly/m31}}, {{DOMMatrixReadOnly/m32}}, {{DOMMatrixReadOnly/m34}},