Update the references in EXTENSIONS.md to refer to whatever is the current version

Author: usarid

guidelines/v2.0/EXTENSIONS.md

@@ -6,14 +6,14 @@ prefixed by "x-" and can have any valid JSON format value.
 
 Currently extension properties are supported in the following definition objects:
 
-* within the [info object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#info-object)
-* within the [paths object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#paths-object)
-* within the [path-item object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#path-item-object)
-* within the [operation object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#operationObject) 
-* within the [parameter object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#parameterObject)
-* within the [responses object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#responses-object)
-* within the [tag object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#tag-object)
-* within the [security-scheme object](https://github.com/OAI/OpenAPI-Specification/blob/OpenAPI.next/versions/2.0.md#security-scheme-object)
+* within the [info object](/versions/2.0.md#info-object)
+* within the [paths object](/versions/2.0.md#paths-object)
+* within the [path-item object](/versions/2.0.md#path-item-object)
+* within the [operation object](/versions/2.0.md#operationObject) 
+* within the [parameter object](/versions/2.0.md#parameterObject)
+* within the [responses object](/versions/2.0.md#responses-object)
+* within the [tag object](/versions/2.0.md#tag-object)
+* within the [security-scheme object](/versions/2.0.md#security-scheme-object)
 
 For example, a vendor extension that adds apis.json specific metadata to an OpenAPI definition might look as follows: