Editorial: fix capitalization of "Object type" (#3086)

spec.html

@@ -2689,7 +2689,7 @@ <h1>
 
     <emu-clause id="sec-object-type">
       <h1>The Object Type</h1>
-      <p>Each instance of the <dfn variants="is an Object,is not an Object">Object Type</dfn>, also referred to simply as “an Object”, represents a collection of properties. Each property is either a data property, or an accessor property:</p>
+      <p>Each instance of the <dfn variants="is an Object,is not an Object">Object type</dfn>, also referred to simply as “an Object”, represents a collection of properties. Each property is either a data property, or an accessor property:</p>
       <ul>
         <li>
           A <dfn variants="data properties">data property</dfn> associates a key value with an ECMAScript language value and a set of Boolean attributes.