Editorial: Fix consistency over instances that are ordinary objects

Ref #386

The consistency matches the text from ECMA-262

spec/collator.html

@@ -338,7 +338,7 @@ <h1>Intl.Collator.prototype.resolvedOptions ()</h1>
     <h1>Properties of Intl.Collator Instances</h1>
 
     <p>
-      Intl.Collator instances inherit properties from %CollatorPrototype%.
+      Intl.Collator instances are ordinary objects that inherit properties from %CollatorPrototype%.
     </p>
 
     <p>

spec/datetimeformat.html

@@ -770,7 +770,7 @@ <h1>Intl.DateTimeFormat.prototype.resolvedOptions ()</h1>
     <h1>Properties of Intl.DateTimeFormat Instances</h1>
 
     <p>
-      Intl.DateTimeFormat instances inherit properties from %DateTimeFormatPrototype%.
+      Intl.DateTimeFormat instances are ordinary objects that inherit properties from %DateTimeFormatPrototype%.
     </p>
 
     <p>

spec/numberformat.html

@@ -701,7 +701,7 @@ <h1>Intl.NumberFormat.prototype.resolvedOptions ()</h1>
     <h1>Properties of Intl.NumberFormat Instances</h1>
 
     <p>
-      Intl.NumberFormat instances inherit properties from %NumberFormatPrototype%.
+      Intl.NumberFormat instances are ordinary objects that inherit properties from %NumberFormatPrototype%.
     </p>
 
     <p>

spec/pluralrules.html

@@ -332,7 +332,7 @@ <h1>Intl.PluralRules.prototype.resolvedOptions ()</h1>
     <h1>Properties of Intl.PluralRules Instances</h1>
 
     <p>
-      Intl.PluralRules instances inherit properties from %PluralRulesPrototype%.
+      Intl.PluralRules instances are ordinary objects that inherit properties from %PluralRulesPrototype%.
     </p>
 
     <p>