[test][prefix] Add dummy documentation to assets

...ackend/python/test/prefix/algorithms/autonomous/add/1.rst

...ckend/python/test/prefix/algorithms/autonomous/add2/1.rst

...ckend/python/test/prefix/algorithms/autonomous/add3/1.rst

...ckend/python/test/prefix/algorithms/autonomous/echo/1.rst

...st/prefix/algorithms/autonomous/invalid_loop_output/1.rst

...ckend/python/test/prefix/algorithms/autonomous/loop/1.rst

.../python/test/prefix/algorithms/autonomous/loop_user/1.rst

...python/test/prefix/algorithms/autonomous/no_prepare/1.rst

...d/python/test/prefix/algorithms/autonomous/no_setup/1.rst

...thon/test/prefix/algorithms/autonomous/parametrized/1.rst

...hon/test/prefix/algorithms/autonomous/prepare_crash/1.rst

...thon/test/prefix/algorithms/autonomous/prepare_fail/1.rst

...hon/test/prefix/algorithms/autonomous/process_crash/1.rst

...ython/test/prefix/algorithms/autonomous/setup_crash/1.rst

...python/test/prefix/algorithms/autonomous/setup_fail/1.rst

...n/test/prefix/algorithms/autonomous/valid_algorithm/1.rst

...on/test/prefix/algorithms/autonomous/valid_analysis/1.rst

beat/backend/python/test/prefix/algorithms/legacy/add/1.rst

beat/backend/python/test/prefix/algorithms/legacy/add2/1.rst

beat/backend/python/test/prefix/algorithms/legacy/echo/1.rst