website/ref/language.md: Document exploding strings. #1787

Job	Run time
Run benchmarks	1m 27s
Check relative links in website	9s
Run checks (ubuntu)	41s
Run tests (emulated riscv64)	1m 9s
Run checks (macos)	23s
Run tests (emulated s390x)	1m 9s
Run tests (ubuntu, 1.23.x)	1m 36s
Run checks (windows)	3m 34s
Run tests (macos, 1.23.x)	1m 44s
Run tests (windows, 1.23.x)	5m 27s
Run tests (ubuntu, 1.22.x)	28s
Upload test coverage (linux)	13s
Upload test coverage (macos)	18s
Upload test coverage (windows)	14s
	18m 32s

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