fixed formatting of Variable substitution table

Author: Ole Lensmar

versions/3.0.md

@@ -1201,8 +1201,8 @@ The variables generated can be used in locations prescribed by the definition.
 In all cases, _variables_ from request and responses may be substituted for link generation.  The table below designates the source of the substitution value and the syntax for accessing it:
 
 Source Location | reference identifier | example value | example reference | notes
----|:---|:---|:---
-HTTP Method            | `$method`         | `/users/{$method}`                | The allowable values for the `$method` will be those for the HTTP operation
+---|:---|:---|:---|:---
+HTTP Method            | `$method`         | `/users/{$method}`                | The allowable values for the `$method` will be those for the HTTP operation 
 Requested content type | `$accepts`        | `/users/3?format={$accepts}`      |  
 Request parameter      | `$request`        | `/users/{$request.id}`            | Request parameters must be declared in the `parameters` section for the operation or they cannot be used in substitution.  This includes request headers
 Request body           | `$requestBody`    | `/users/{$requestBody.user.uuid}` | For operations which accept payloads, references may be made to portions of the `requestBody` or the entire body itself