docs: Review rel_try() reasons and docs

[krlmlr]

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This is how benchmark results would change (along with a 95% confidence interval in relative change) if 92d553e is merged into main:

• ✔️001_tpch_01: 22.4ms -> 22.7ms [-2.81%, +5.53%]
• ✔️001_tpch_02: 66.1ms -> 66.2ms [-0.5%, +0.79%]
• ✔️001_tpch_03: 38.1ms -> 38.5ms [-0.32%, +2.72%]
• ✔️001_tpch_04: 21.7ms -> 21.8ms [-0.63%, +0.85%]
• ✔️001_tpch_05: 55.9ms -> 56.1ms [-0.47%, +1.32%]
• ✔️001_tpch_06: 13.9ms -> 13.8ms [-2.94%, +1.74%]
• ✔️001_tpch_07: 73.5ms -> 73.5ms [-0.59%, +0.75%]
• 🚀001_tpch_08: 96ms -> 95.2ms [-1.55%, -0.02%]
• ✔️001_tpch_09: 71ms -> 70.8ms [-1.14%, +0.7%]
• ✔️001_tpch_10: 47.5ms -> 47.4ms [-1.05%, +0.62%]
• ✔️001_tpch_11: 31.8ms -> 32.1ms [-1.24%, +3.33%]
• ✔️001_tpch_12: 27ms -> 26.8ms [-2.91%, +1.02%]
• ✔️001_tpch_13: 24.7ms -> 24.3ms [-3.51%, +0.72%]
• ✔️001_tpch_14: 19.7ms -> 19.7ms [-1.14%, +0.47%]
• ✔️001_tpch_15: 31.1ms -> 31.5ms [-0.78%, +3.43%]
• ✔️001_tpch_16: 38.8ms -> 38.8ms [-0.89%, +0.63%]
• ✔️001_tpch_17: 25.5ms -> 25.4ms [-1.24%, +0.47%]
• ✔️001_tpch_18: 21.7ms -> 21.6ms [-2.36%, +1.18%]
• ✔️001_tpch_19: 65.7ms -> 65.6ms [-1.17%, +0.65%]
• ✔️001_tpch_20: 49.4ms -> 49.5ms [-0.68%, +0.8%]
• ✔️001_tpch_21: 77.4ms -> 77.7ms [-0.61%, +1.34%]
• ✔️001_tpch_22: 64.7ms -> 64.9ms [-0.39%, +0.87%]
• ✔️010_tpch_01: 78.9ms -> 80.5ms [-3.87%, +8.14%]
• ✔️010_tpch_02: 70ms -> 69.6ms [-1.81%, +0.74%]
• ✔️010_tpch_03: 59.3ms -> 58.8ms [-4.48%, +2.99%]
• ✔️010_tpch_04: 42.5ms -> 42.9ms [-1.75%, +3.49%]
• ✔️010_tpch_05: 90.3ms -> 92.3ms [-2.82%, +7.37%]
• ✔️010_tpch_06: 31.6ms -> 31.9ms [-8.45%, +10.85%]
• ✔️010_tpch_07: 106ms -> 106ms [-1.36%, +1.28%]
• ✔️010_tpch_08: 126ms -> 127ms [-0.35%, +1.11%]
• ✔️010_tpch_09: 116ms -> 116ms [-1.74%, +2.85%]
• ✔️010_tpch_10: 74.4ms -> 74.2ms [-2.07%, +1.58%]
• ✔️010_tpch_11: 36.6ms -> 37ms [-1.53%, +3.73%]
• ✔️010_tpch_12: 56.8ms -> 57.5ms [-1.95%, +4.43%]
• ✔️010_tpch_13: 51.3ms -> 51.1ms [-1.31%, +0.26%]
• ✔️010_tpch_14: 36.7ms -> 37.4ms [-1.19%, +5.04%]
• ✔️010_tpch_15: 53.6ms -> 53.8ms [-6.55%, +7.33%]
• ✔️010_tpch_16: 43.9ms -> 43.1ms [-4.85%, +1.07%]
• ✔️010_tpch_17: 52.4ms -> 53.1ms [-2.19%, +5.08%]
• ✔️010_tpch_18: 53.1ms -> 52.1ms [-7.87%, +3.82%]
• ❗🐌010_tpch_19: 115ms -> 116ms [+0.13%, +1.95%]
• ✔️010_tpch_20: 65.5ms -> 64.8ms [-3.88%, +1.78%]
• ✔️010_tpch_21: 236ms -> 238ms [-1.45%, +3.79%]
• ✔️010_tpch_22: 75.5ms -> 76.4ms [-0.44%, +2.69%]
• ✔️100_tpch_01: 323ms -> 310ms [-22.58%, +14.36%]
• ✔️100_tpch_02: 124ms -> 123ms [-4.16%, +2.44%]
• ✔️100_tpch_03: 177ms -> 179ms [-2.14%, +3.66%]
• ✔️100_tpch_04: 147ms -> 160ms [-8.54%, +25.78%]
• ✔️100_tpch_05: 255ms -> 248ms [-13.46%, +8%]
• ✔️100_tpch_06: 105ms -> 103ms [-19.64%, +15.98%]
• ✔️100_tpch_07: 230ms -> 236ms [-6.03%, +11.24%]
• ✔️100_tpch_08: 269ms -> 258ms [-13.69%, +5.48%]
• ✔️100_tpch_09: 326ms -> 343ms [-7.06%, +17.47%]
• ✔️100_tpch_10: 215ms -> 219ms [-9.47%, +12.7%]
• ✔️100_tpch_11: 81.7ms -> 81.7ms [-1.12%, +1.13%]
• ✔️100_tpch_12: 202ms -> 194ms [-11.82%, +3.61%]
• ✔️100_tpch_13: 301ms -> 305ms [-3.1%, +5.95%]
• ✔️100_tpch_14: 130ms -> 127ms [-8.55%, +4.67%]
• ✔️100_tpch_15: 222ms -> 211ms [-11.78%, +1.39%]
• ✔️100_tpch_16: 132ms -> 121ms [-18.38%, +2.42%]
• ✔️100_tpch_17: 181ms -> 177ms [-12.01%, +8.35%]
• ✔️100_tpch_18: 192ms -> 196ms [-10.77%, +14.86%]
• ✔️100_tpch_19: 300ms -> 286ms [-16.56%, +7.37%]
• ✔️100_tpch_20: 181ms -> 174ms [-11.93%, +3.34%]
• ✔️100_tpch_21: 1.31s -> 1.29s [-6.84%, +3.4%]
• 🚀100_tpch_22: 171ms -> 166ms [-4.6%, -1.29%]

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