EFA(3pm): document accessibility options

backed may return an empty result if no such connection exists or bike-support

simply isn't known.

=item B<with_low_platform> => B<0>|B<1>

If true: Request connections which only use low-platform ("Niederflur")

vehicles. Note that the backed will return an empty result if no such

connection exists.

=item B<with_wheelchair> => B<0>|B<1>

If true: Request connections which are wheelchair-accessible. Again, note that

the backend may return an empty result if no such connection exists or

wheelchair-support isn't known.

=item B<without_elevators> => B<0>|B<1>

If true: Request that transfers do not require usage of elevators.

=item B<without_escalators> => B<0>|B<1>

If true: Request that transfers do not require usage of escalators.

=item B<without_solid_stairs> => B<0>|B<1>

If true: Request that transfers do not require stairs to be taken (i.e.

ramps, escalators, elevators or similar must be available).

=item B<lwp_options> => I<\%hashref>

Options to pass to C<< LWP::UserAgent->new >>.