Don't float affix below md.
Don't float affix below md.

The ToC looks terrible floating over text.


Former-commit-id: eefce6624b3de888a744fa3767e3610beee142dc [formerly 154e88eeb4037282baba542d7774423380506312] [formerly 7dc5e7253c5aeedfa2ba567bbc3e6f865e0f8c49]
Former-commit-id: b953cd7e0d772146c910c622776c8c718ef250e9 [formerly 610e2a834555aae016ecb72eb21b8309877e84e3]
Former-commit-id: 724890c1bed9e6bbf06ab926c65933d5e0f571b9
ritjoe/ofCourse,ryansb/ofCourse,ritjoe/ofCourse,sctjkc01/ofCourse,ryansb/ofCourse,sctjkc01/ofCourse