fixup docs too

website/content/api-docs/evaluations.mdx

@@ -31,10 +31,10 @@ The table below shows this endpoint's support for
   even number of hexadecimal characters (0-9a-f). This is specified as a query
   string parameter.
 
-- `last_token` `(string: "")` - This endpoint supports paging. The
-  `last_token` parameter accepts a string which is the `ID` field of
-  the last evaluation seen in the previous response, to request the
-  next page of responses.
+- `next_token` `(string: "")` - This endpoint supports paging. The
+  `next_token` parameter accepts a string which is the `ID` field of
+  the next expected evaluation. This value can be obtained from the
+  `X-Nomad-NextToken` header from the previous response.
 
 - `per_page` `(int: 0)` - Specifies a maximum number of evaluations to
   return for this request. If omitted, the response is not