Update 3.0.md

links fixed

Author: amrapalijz

versions/3.0.md

@@ -43,7 +43,7 @@ Additional utilities, such as testing tools, can also use the files.
 		- [Path Item Object](#pathItemObject)
 		- [Operation Object](#operationObject)
 		- [External Documentation Object](#externalDocumentationObject)
-		- [External Resource Object](#externalDocumentationObject)
+		- [External Resource Object](#externalResourceObject)
 		- [Parameter Object](#parameterObject)
 		- [Request Body Object](#requestBodyObject)
 		- [Media Type Object](#mediaTypeObject)
@@ -1024,7 +1024,7 @@ This object can be extended with [Specification Extensions](#specificationExtens
   type: website
 ```
 
-#### <a name="externalResourceObject"></a>External Resource Object
+#### <a name="externalResourceObject"></a>External Resource Object [smartAPI extension]
 
 Allows referencing external resources for extended documentation.
 
@@ -1036,7 +1036,7 @@ Field Name | Type | Description
 <a name="externalResourceType"></a>x-type | `enum` | **REQUIRED** values: `api documentation`, `website`,`developer forum`,`mailing list`,`social media`,`publication` </a>
 <a name="externalResourceDescription"></a>x-description | `string` | A short description of the target documentation. [CommonMark syntax](http://spec.commonmark.org/) can be used for rich text representation.
 
-##### External Resource Object Example
+##### External Resource Object smartAPI Example
 
 ```yaml
 - x-url: http://example.org/api/docs