Fix docs and changelog #997

Job	Run time
build_python_27 (ubuntu-20.04, yes)	2m 42s
mypy	21s
build_python_27 (ubuntu-20.04, no)	2m 38s
build (3.6, yes, ubuntu-20.04)	2m 35s
test_c_linux (0, x64)	58s
build_python_27 (windows-latest, yes)	4m 51s
build (3.6, no, ubuntu-20.04)	2m 36s
test_c_linux (0, x32)	1m 8s
build_python_27 (windows-latest, no)	4m 15s
build (3.7, yes, ubuntu-20.04)	2m 52s
test_c_linux (1, x64)	57s
build (3.7, no, ubuntu-20.04)	2m 32s
python_no_gil	3m 18s
test_c_linux (1, x32)	1m 10s
build (3.8, yes, ubuntu-20.04)	2m 22s
build (3.8, no, ubuntu-20.04)	2m 34s
test_c_windows (x64)	59s
build (3.9, yes, ubuntu-20.04)	2m 28s
test_c_windows (win32)	1m 13s
build (3.9, no, ubuntu-20.04)	2m 14s
build (3.10, yes, ubuntu-20.04)	2m 29s
build (3.10, no, ubuntu-20.04)	2m 16s
build (3.11, yes, ubuntu-20.04)	2m 1s
build (3.11, no, ubuntu-20.04)	1m 59s
build (3.12, yes, ubuntu-20.04)	2m 3s
build (3.12, no, ubuntu-20.04)	2m 11s
build (3.13-dev, yes, ubuntu-20.04)	2m 11s
build (3.13-dev, no, ubuntu-20.04)	2m 26s
build (3.12, yes, macos-12)	3m 14s
build (3.12, no, windows-latest)	4m 35s
build (3.12, yes, windows-latest)	4m 17s
build (pypy2.7, no, ubuntu-latest)	1m 31s
build (pypy3.9, no, ubuntu-latest)	1m 51s
	1h 17m 47s

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