A small update on examples.md for 1-based indexing

[liuyxpp]

Since we are in Julia not in Python, the indices of x3 and x0 should really be x4 and x1 to be consistent with the code to avoid any confusion.

[github-actions]

Benchmark Results

	master	7a079a6...	master/7a079a6926a990...
search/multithreading	25.8 ± 0.8 s	26.1 ± 1.1 s	0.987
search/serial	33.6 ± 0.081 s	33 ± 0.15 s	1.02
utils/best_of_sample	0.972 ± 0.3 μs	0.922 ± 0.35 μs	1.05
utils/check_constraints_x10	11.4 ± 3 μs	11.5 ± 2.9 μs	0.996
utils/compute_complexity_x10/Float64	2.21 ± 0.11 μs	2.19 ± 0.11 μs	1.01
utils/compute_complexity_x10/Int64	2.18 ± 0.11 μs	2.18 ± 0.11 μs	1
utils/compute_complexity_x10/nothing	1.44 ± 0.091 μs	1.44 ± 0.1 μs	1
utils/optimize_constants_x10	30.8 ± 6.6 ms	30.9 ± 6.9 ms	0.996
time_to_load	0.915 ± 0.0089 s	0.928 ± 0.013 s	0.987

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[MilesCranmer]

Good point! Thanks