Update header in documentation.

Author: joselfonseca

docs/api/blueprint/routes/users.apib

@@ -9,7 +9,7 @@ It requires your user to have permissions to fetch, create, update or delete use
 
 This endpoint will allow you to get the users registered in the system
 
-+ Request (application/json)
++ Request (application/vnd.api.v1+json)
 
     + Headers
 
@@ -41,7 +41,7 @@ This endpoint will allow you to get the users registered in the system
 ### Create User [POST]
 This endpoint will allow you to create a user in the system
 
-+ Request (application/json)
++ Request (application/vnd.api.v1+json)
 
     + Headers
 
@@ -77,7 +77,7 @@ This endpoint will allow you to get a single user
 + Parameters
     + id: `d4d42ea0-ee77-11e6-b823-6d63c6504afc` (string, required) The user ID
 
-+ Request (application/json)
++ Request (application/vnd.api.v1+json)
 
     + Headers
 
@@ -107,7 +107,7 @@ This endpoint will allow you to update the user's information, in this case the
 + Parameters
     + id: `d4d42ea0-ee77-11e6-b823-6d63c6504afc` (string, required) The user ID
 
-+ Request (application/json)
++ Request (application/vnd.api.v1+json)
 
     + Headers
 
@@ -142,7 +142,7 @@ This endpoint will allow you to update the user's information, please note that
 + Parameters
     + id: `d4d42ea0-ee77-11e6-b823-6d63c6504afc` (string, required) The user ID
 
-+ Request (application/json)
++ Request (application/vnd.api.v1+json)
 
     + Headers
 
@@ -178,7 +178,7 @@ This endpoint will allow you to delete a user from the system
 + Parameters
     + id: `d4d42ea0-ee77-11e6-b823-6d63c6504afc` (string, required) The user ID
 
-+ Request (application/json)
++ Request (application/vnd.api.v1+json)
 
     + Headers