Add PT020 doc

[harupy]

Summary

#2646

Test Plan

[github-actions]

PR Check Results

Ecosystem

✅ ecosystem check detected no changes.

Benchmark

Linux

group                                      main                                   pr
-----                                      ----                                   --
formatter/large/dataset.py                 1.08     10.2±0.42ms     4.0 MB/sec    1.00      9.5±0.40ms     4.3 MB/sec
formatter/numpy/ctypeslib.py               1.00  1907.4±80.64µs     8.7 MB/sec    1.05  1997.1±106.88µs     8.3 MB/sec
formatter/numpy/globals.py                 1.15   242.4±16.38µs    12.2 MB/sec    1.00   211.0±14.74µs    14.0 MB/sec
formatter/pydantic/types.py                1.00      4.3±0.24ms     5.9 MB/sec    1.02      4.4±0.20ms     5.8 MB/sec
linter/all-rules/large/dataset.py          1.05     14.3±1.24ms     2.8 MB/sec    1.00     13.6±0.77ms     3.0 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.03      3.6±0.16ms     4.6 MB/sec    1.00      3.5±0.19ms     4.8 MB/sec
linter/all-rules/numpy/globals.py          1.04   454.5±20.16µs     6.5 MB/sec    1.00   438.1±20.99µs     6.7 MB/sec
linter/all-rules/pydantic/types.py         1.00      6.1±0.36ms     4.2 MB/sec    1.00      6.1±0.25ms     4.2 MB/sec
linter/default-rules/large/dataset.py      1.00      6.7±0.23ms     6.1 MB/sec    1.04      6.9±0.34ms     5.9 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00  1432.5±82.91µs    11.6 MB/sec    1.01  1441.3±59.56µs    11.6 MB/sec
linter/default-rules/numpy/globals.py      1.03   171.0±12.74µs    17.3 MB/sec    1.00   166.6±13.37µs    17.7 MB/sec
linter/default-rules/pydantic/types.py     1.00      3.0±0.10ms     8.5 MB/sec    1.01      3.0±0.12ms     8.4 MB/sec

Windows

group                                      main                                   pr
-----                                      ----                                   --
formatter/large/dataset.py                 1.00     11.3±0.26ms     3.6 MB/sec    1.08     12.2±0.27ms     3.3 MB/sec
formatter/numpy/ctypeslib.py               1.00      2.2±0.06ms     7.6 MB/sec    1.07      2.3±0.05ms     7.1 MB/sec
formatter/numpy/globals.py                 1.00   248.7±10.57µs    11.9 MB/sec    1.03    255.1±5.97µs    11.6 MB/sec
formatter/pydantic/types.py                1.00      4.8±0.20ms     5.3 MB/sec    1.07      5.2±0.12ms     4.9 MB/sec
linter/all-rules/large/dataset.py          1.00     15.8±0.22ms     2.6 MB/sec    1.01     16.0±0.32ms     2.5 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.00      4.1±0.08ms     4.1 MB/sec    1.01      4.1±0.11ms     4.0 MB/sec
linter/all-rules/numpy/globals.py          1.00   488.9±14.92µs     6.0 MB/sec    1.01   493.0±11.81µs     6.0 MB/sec
linter/all-rules/pydantic/types.py         1.00      7.1±0.11ms     3.6 MB/sec    1.00      7.1±0.17ms     3.6 MB/sec
linter/default-rules/large/dataset.py      1.01      8.2±0.13ms     5.0 MB/sec    1.00      8.1±0.13ms     5.0 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00  1694.4±31.66µs     9.8 MB/sec    1.00  1686.6±23.53µs     9.9 MB/sec
linter/default-rules/numpy/globals.py      1.01    193.0±5.74µs    15.3 MB/sec    1.00    190.5±4.14µs    15.5 MB/sec
linter/default-rules/pydantic/types.py     1.02      3.7±0.08ms     6.9 MB/sec    1.00      3.6±0.04ms     7.1 MB/sec