Not all "strict" params should be "Requirements" in the documentation, closes #229

If you want to have "strict" QueryParams (for Regex checking for example) with the "nullable=true" option, this FOSRestBundle annotation should still be considered a Filter in the documentation and not a Requirement.

    @Rest\QueryParam(name="types", requirements="^([a-z_]+,{0,1})+$", strict=true, nullable=true, description="Example"