[ADAM-1917] Try 3: fix Sphinx fulltoc.
[ADAM-1917] Try 3: fix Sphinx fulltoc.

Move fulltoc below the specific Sphinx version in requirements.txt.
Resolves #1917?

bigdatagenomics/adam,bigdatagenomics/adam,heuermh/adam,bigdatagenomics/adam,bigdatagenomics/adam,heuermh/adam,heuermh/adam,heuermh/adam