Apply errata for to, cc, bto, bcc

Per issue #482, this change gives clearer definitions of these addressing properties.

Author: evanp

vocabulary/index.html

@@ -3196,8 +3196,8 @@ <h2>Properties</h2>
         <tr>
           <td>Notes:</td>
           <td>
-            Identifies one or more Objects that are part of the private
-            secondary audience of this Object.
+            Identifies one or more entities that are part of the private 
+secondary audience of this Object.
           </td>
         </tr>
         <tr>
@@ -3232,8 +3232,7 @@ <h2>Properties</h2>
         <tr>
           <td>Notes:</td>
           <td>
-            Identifies an Object that is part of the private primary audience
-            of this Object.
+            Identifies one or more entities that are part of the private primary audience of this Object.
           </td>
         </tr>
         <tr>
@@ -3268,8 +3267,8 @@ <h2>Properties</h2>
         <tr>
           <td>Notes:</td>
           <td>
-            Identifies an Object that is part of the public secondary audience
-            of this Object.
+            Identifies one or more entities that are part of the 
+public secondary audience of this Object.
           </td>
         </tr>
         <tr>
@@ -4473,8 +4472,7 @@ <h2>Properties</h2>
         <tr>
           <td>Notes:</td>
           <td>
-            Identifies an entity considered to be part of the public primary
-            audience of an Object
+            Identifies one or more entities that are part of the public primary audience of this Object.
           </td>
         </tr>
         <tr>