Improve some documentation
Update super_path_induction

It's now path_induction_hammer.  And soon it'll be in HoTT/HoTT.  But,
unfortunately, it's slightly slower on Category/Equality.  I might go
look into that at somepoint.

After    | File Name                             | Before
-----------------------------------------------------------
0m19.72s | Category/Equality                     | 0m16.60s
0m10.60s | Comma/Duals                           | 0m10.72s
0m08.20s | Comma/InducedFunctors                 | 0m07.92s
0m07.29s | Groupoid                              | 0m09.07s
0m05.20s | Category/Morphisms                    | 0m05.61s
0m04.59s | SumPreCategory                        | 0m04.62s
0m04.30s | Groupoid/Duals                        | 0m04.40s
0m04.05s | Functor/Equality                      | 0m04.52s
0m03.92s | Groupoid/Functors                     | 0m03.72s
0m03.27s | UniversalProperties                   | 0m03.40s
0m02.75s | Grothendieck/ToSet                    | 0m02.88s
0m02.48s | Comma/CommaCategory                   | 0m02.40s
0m02.26s | BoolCategory                          | 0m02.42s
0m01.89s | NaturalTransformation/Equality        | 0m01.84s
0m01.83s | NaturalTransformation/Duals           | 0m01.82s
0m01.79s | Category/Product                      | 0m01.85s
0m01.73s | Hom                                   | 0m01.79s
0m01.37s | NaturalTransformation/Composition     | 0m01.42s
0m01.36s | NaturalTransformation/Product         | 0m01.35s
0m01.28s | NaturalTransformation/CompositionLaws | 0m01.21s
0m01.22s | Functor/Product                       | 0m01.23s
0m01.08s | NaturalTransformation/Isomorphisms    | 0m01.12s
0m00.96s | FunctorCategory/Morphisms             | 0m00.95s
0m00.75s | Cat/Morphisms                         | 0m00.80s
0m00.68s | InitialTerminalCategory               | 0m00.61s
0m00.49s | Functor/CompositionLaws               | 0m00.52s
0m00.40s | Comma/Projection                      | 0m00.40s
0m00.37s | Discrete/Duals                        | 0m00.33s
0m00.34s | IndiscreteCategory                    | 0m00.31s
0m00.31s | SetCategory                           | 0m00.30s
0m00.30s | Cat                                   | 0m00.34s
0m00.30s | Common                                | 0m00.32s
0m00.28s | Functor/Composition                   | 0m00.25s
0m00.27s | FunctorCategory                       | 0m00.31s
0m00.27s | NaturalTransformation/Identity        | 0m00.26s
0m00.26s | Category/Objects                      | 0m00.26s
0m00.26s | Functor/Duals                         | 0m00.27s
0m00.26s | Adjoint/UnitCounit                    | 0m00.27s
0m00.23s | NatCategory                           | 0m00.23s
0m00.22s | IsGroupoid                            | 0m00.26s
0m00.21s | NaturalTransformation/Core            | 0m00.16s
0m00.18s | Category/Core                         | 0m00.18s
0m00.16s | NatCategory/Duals                     | 0m00.18s
0m00.16s | NaturalNumbersObject                  | 0m00.14s
0m00.14s | ComputableCat                         | 0m00.17s
0m00.14s | Peano                                 | 0m00.12s
0m00.13s | Category/Duals                        | 0m00.13s
0m00.12s | NaturalTransformation                 | 0m00.11s
0m00.12s | Functor                               | 0m00.12s
0m00.11s | Functor/Core                          | 0m00.12s
0m00.10s | Functor/Identity                      | 0m00.08s
0m00.10s | DiscreteCategory                      | 0m00.09s
0m00.10s | Grothendieck                          | 0m00.10s
0m00.09s | Category/UnivalentCategory            | 0m00.11s
0m00.08s | Category/StrictCategory               | 0m00.07s
0m00.07s | Category                              | 0m00.08s
0m00.07s | Utf8                                  | 0m00.11s
0m00.06s | NotationsUtf8                         | 0m00.04s
0m00.04s | Notations                             | 0m00.05s
-----------------------------------------------------------
1m41.31s | Total                                 | 1m41.06s