Better documentation for "Account display name".

Give examples of what the display name is.

Change-Id: I2934dc9e8b95d0b32b9c1e9fab391d7ba9e997da

emailcommon/src/com/android/emailcommon/provider/Account.java

@@ -292,7 +292,9 @@ public final class Account extends EmailContent implements Parcelable {
     }
 
     /**
-     * @return the user-visible name for the account
+     * Returns the user-visible name for the account, eg. "My work address"
+     * or "foo@exemple.com".
+     * @return the user-visible name for the account.
      */
     public String getDisplayName() {
         return mDisplayName;