Update PyInstaller example and docs for loading tilesets #940

Job	Run time
mypy	24s
ruff	5s
sdist	47s
tox (ubuntu-latest)	1m 25s
tox (windows-latest)	1m 33s
parse_sdl (windows-latest, 2.0.14)	47s
build-macos (cp38-*_universal2)	5m 15s
parse_sdl (windows-latest, 2.0.16)	41s
linux-wheels (x86_64, cp38-manylinux*)	1m 56s
build-macos (pp38-*)	4m 18s
linux-wheels (x86_64, pp38-manylinux*)	2m 4s
parse_sdl (macos-latest, 2.0.14)	28s
build (ubuntu-latest, 3.8, x64)	2m 34s
linux-wheels (aarch64, cp38-manylinux*)	11m 3s
parse_sdl (macos-latest, 2.0.16)	27s
build (ubuntu-latest, pypy-3.8, x64)	2m 27s
linux-wheels (aarch64, pp38-manylinux*)	10m 2s
build (windows-latest, 3.8, x64)	3m 36s
test-docs	1m 17s
build (windows-latest, pypy-3.8, x64)	3m 46s
build (windows-latest, 3.8, x86)	3m 2s
build (windows-latest, pypy-3.8, x86)	3m 48s
publish	0s
	1h 1m 45s

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