[Patch-gnuradio] minor patch to gr-trellis.xml

[Tim Meehan]

Please see attached minor patch for gr-trellis.xml

This updates the documentation to include the two public methods

void write_trellis_svg(std::string filename ,int number_stages);
and
void write_fsm_txt(std::string filename);

It also updates the documentation for trellis_viterbi to include
multiple stop and start states and support for irregular trellis
(different number of input branches than ouput branches at a state)

Tim

gr-trellis.xml.patch
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