Some small doc touchups

[kshyatt]

Backticks, typo fixes, add Example header

[github-actions]

Benchmark Results

	main	13b45b2...	main / 13b45b2...
basics/make_zero/namedtuple	0.0514 ± 0.0041 μs	0.0506 ± 0.0097 μs	1.02 ± 0.21
basics/make_zero/struct	0.202 ± 0.008 μs	0.208 ± 0.0087 μs	0.975 ± 0.056
basics/overhead	4.07 ± 0 ns	3.8 ± 0.009 ns	1.07 ± 0.0025
basics/remake_zero!/namedtuple	0.182 ± 0.011 μs	0.181 ± 0.011 μs	1 ± 0.086
basics/remake_zero!/struct	0.181 ± 0.011 μs	0.182 ± 0.011 μs	0.994 ± 0.088
fold_broadcast/multidim_sum_bcast/1D	8.21 ± 1.7 μs	8.22 ± 1.9 μs	0.999 ± 0.31
fold_broadcast/multidim_sum_bcast/2D	9.84 ± 1.9 μs	8.36 ± 1.7 μs	1.18 ± 0.33
time_to_load	1.42 ± 0.026 s	1.44 ± 0.032 s	0.986 ± 0.028

Benchmark Plots

A plot of the benchmark results has been uploaded as an artifact at https://github.com/EnzymeAD/Enzyme.jl/actions/runs/28963213723/artifacts/8177156819.