docs: explicitly state how to change DuckDB configuration options

[maelle]

Fix #485

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 2b43bfa is merged into main:

• ✔️001_tpch_01: 23.7ms -> 23.6ms [-5.48%, +4.14%]
• ✔️001_tpch_02: 64.1ms -> 64.4ms [-1.66%, +2.52%]
• ✔️001_tpch_03: 39.4ms -> 39.6ms [-2.02%, +3.12%]
• ✔️001_tpch_04: 27.7ms -> 27.9ms [-0.57%, +2.21%]
• ✔️001_tpch_05: 57.8ms -> 58.2ms [-1.34%, +2.53%]
• ❗🐌001_tpch_06: 11.6ms -> 12.1ms [+0.03%, +8.47%]
• ✔️001_tpch_07: 72.9ms -> 71.7ms [-3.38%, +0.12%]
• ✔️001_tpch_08: 97.5ms -> 97.8ms [-1.37%, +2.14%]
• ✔️001_tpch_09: 69.2ms -> 69.5ms [-1.73%, +2.68%]
• ✔️001_tpch_10: 48.7ms -> 48.4ms [-2.94%, +1.45%]
• ✔️001_tpch_11: 38.1ms -> 38.3ms [-1.33%, +2.46%]
• ✔️001_tpch_12: 21.2ms -> 21.1ms [-2.76%, +1.87%]
• ✔️001_tpch_13: 18.1ms -> 17.9ms [-3.48%, +0.49%]
• ✔️001_tpch_14: 16.6ms -> 16.8ms [-1.35%, +3.31%]
• ✔️001_tpch_15: 36.9ms -> 36.9ms [-2.72%, +2.91%]
• ✔️001_tpch_16: 37.3ms -> 37.2ms [-2.36%, +1.93%]
• ✔️001_tpch_17: 31.7ms -> 31.8ms [-3.02%, +3.45%]
• ✔️001_tpch_18: 28.5ms -> 28ms [-4.19%, +0.48%]
• ✔️001_tpch_19: 37.9ms -> 37.8ms [-1.58%, +0.77%]
• 🚀001_tpch_20: 55ms -> 53.5ms [-5.17%, -0.46%]
• ✔️001_tpch_21: 83.6ms -> 83.8ms [-1.98%, +2.41%]
• ✔️001_tpch_22: 46.1ms -> 46.5ms [-1.33%, +2.81%]
• ❗🐌010_tpch_01: 83.2ms -> 85.8ms [+0.36%, +5.78%]
• ✔️010_tpch_02: 72.6ms -> 72.7ms [-2.37%, +2.79%]
• ✔️010_tpch_03: 59.4ms -> 60.2ms [-4.07%, +6.69%]
• ✔️010_tpch_04: 43.3ms -> 42.9ms [-3.81%, +1.93%]
• ✔️010_tpch_05: 89.4ms -> 90ms [-1.86%, +3.3%]
• ✔️010_tpch_06: 28.5ms -> 28.9ms [-5.39%, +8%]
• ✔️010_tpch_07: 102ms -> 104ms [-0.28%, +4.42%]
• ✔️010_tpch_08: 127ms -> 126ms [-2.27%, +1.03%]
• ✔️010_tpch_09: 117ms -> 116ms [-3.1%, +1.68%]
• ✔️010_tpch_10: 74.1ms -> 74.5ms [-1.8%, +2.72%]
• ✔️010_tpch_11: 38.3ms -> 37.8ms [-4.62%, +1.93%]
• ✔️010_tpch_12: 50.9ms -> 50.2ms [-5.6%, +2.57%]
• ✔️010_tpch_13: 51.2ms -> 50.2ms [-7.86%, +4.02%]
• ✔️010_tpch_14: 33.5ms -> 33.3ms [-2.8%, +2.09%]
• ✔️010_tpch_15: 53.2ms -> 50.4ms [-12.28%, +1.96%]
• ✔️010_tpch_16: 38.7ms -> 38.3ms [-3.5%, +1.58%]
• ✔️010_tpch_17: 54.3ms -> 52.6ms [-9.39%, +3.4%]
• ✔️010_tpch_18: 53.8ms -> 53.5ms [-8.32%, +7.01%]
• ✔️010_tpch_19: 83.5ms -> 83.7ms [-1.89%, +2.42%]
• ✔️010_tpch_20: 65.7ms -> 64.3ms [-6.57%, +2.55%]
• ✔️010_tpch_21: 245ms -> 248ms [-1%, +3.54%]
• ✔️010_tpch_22: 53.5ms -> 54ms [-1.4%, +3.18%]
• ✔️100_tpch_01: 377ms -> 379ms [-0.48%, +1.25%]
• ✔️100_tpch_02: 129ms -> 124ms [-13.36%, +4.96%]
• ✔️100_tpch_03: 173ms -> 168ms [-9.68%, +4.59%]
• ✔️100_tpch_04: 150ms -> 148ms [-8.72%, +5.57%]
• ✔️100_tpch_05: 269ms -> 271ms [-12.41%, +14.15%]
• ✔️100_tpch_06: 98.3ms -> 95.8ms [-20.47%, +15.34%]
• ✔️100_tpch_07: 225ms -> 220ms [-12.28%, +7.58%]
• ✔️100_tpch_08: 272ms -> 263ms [-13.52%, +6.77%]
• ✔️100_tpch_09: 327ms -> 335ms [-2.04%, +7%]
• ✔️100_tpch_10: 214ms -> 216ms [-4.26%, +5.64%]
• ✔️100_tpch_11: 95.4ms -> 87ms [-28.32%, +10.74%]
• ✔️100_tpch_12: 178ms -> 184ms [-5.69%, +11.92%]
• ✔️100_tpch_13: 327ms -> 324ms [-4.99%, +3.46%]
• ✔️100_tpch_14: 113ms -> 123ms [-0.36%, +17.55%]
• ✔️100_tpch_15: 196ms -> 208ms [-5.43%, +17.5%]
• ✔️100_tpch_16: 121ms -> 119ms [-6.15%, +2.59%]
• ✔️100_tpch_17: 178ms -> 195ms [-4.4%, +23.23%]
• ✔️100_tpch_18: 193ms -> 194ms [-13.35%, +14.77%]
• ✔️100_tpch_19: 260ms -> 264ms [-16.56%, +19.95%]
• ✔️100_tpch_20: 170ms -> 177ms [-8.18%, +17.15%]
• ✔️100_tpch_21: 1.34s -> 1.33s [-3.95%, +3.2%]
• ✔️100_tpch_22: 148ms -> 150ms [-3.38%, +6.4%]

Further explanation regarding interpretation and methodology can be found in the documentation.

[krlmlr]

Will tweak locally and merge.

[krlmlr]

Thanks!