doc: Improve config file doc (#1545) #5990

Job	Run time
external-build	1m 47s
android (armeabi-v7a)	1m 47s
android (arm64-v8a)	1m 38s
Update LFS data cache	15s
android (x86)	1m 43s
android (x86_64)	1m 45s
coverage	4m 56s
macos (commit)	14m 41s
macos_arm (commit, no-bundle, no-static)	4m 19s
linux (commit, standard)	5m 9s
macos (v9.3.1)	10m 27s
macos_arm (v9.3.1, no-bundle, no-static)	4m 18s
macos (v9.2.6)	12m 36s
linux (v9.3.1, standard)	4m 40s
macos_arm (v9.2.6, no-bundle, no-static)	3m 48s
linux (v9.2.6, standard)	4m 9s
macos_arm (commit, bundle, no-static)	4m 33s
python-packaging (ubuntu-latest)	2m 46s
linux (headless, commit, raytracing, optional-deps, no-exclude-deprecated, egl, no-static)	5m 22s
macos_arm (commit, no-bundle, static)	3m 30s
python-packaging (windows-latest)	3m 55s
linux (exclude_deprecated, commit, raytracing, optional-deps, exclude-deprecated, no-egl, no-static)	5m 16s
sanitizer (address)	6m 58s
python-packaging (macos-13)	4m 6s
linux (no_optional_deps, commit, no-raytracing, no-optional-deps, no-exclude-deprecated, no-egl, ...	3m 43s
sanitizer (thread)	10m 57s
linux (static_libs, commit, no-raytracing, optional-deps, no-exclude-deprecated, no-egl, static)	4m 38s
sanitizer (undefined)	5m 21s
static-analysis	3m 20s
windows (commit, no-static)	8m 19s
windows (v9.3.1, no-static)	7m 46s
windows (v9.2.6, no-static)	7m 5s
windows (commit, static)	7m 59s
	2h 53m 32s

Provide feedback