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docs: describe MP4 export cancellation and its manual check #2700

Job	Run time
Docs	10s
Typecheck (tests)	53s
Test	2m 11s
Lint	32s
Rust check (Windows compositor)	3m 19s
Build	46s
Swift test (macOS capture helper)	1m 40s
Rust test (Linux compositor)	7m 19s
Type Check	37s
Rust test (macOS compositor)	5m 53s
AppStream metadata	14s
Validate PR title (semantic)	0s
	23m 34s