[doc] add missing language to code-block directive #2625

Job	Run time
build (pypy3.7, wikipedia:en)	32m 22s
build (pypy3.7, wikisource:zh)	29m 40s
build (pypy3.10, wikipedia:en)	30m 13s
build (pypy3.10, wikisource:zh)	26m 43s
build (3.7, wikipedia:en)	23m 24s
build (3.7, wikisource:zh)	21m 17s
build (3.8, wikipedia:en)	23m 15s
build (3.8, wikisource:zh)	21m 38s
build (3.9, wikipedia:en)	23m 53s
build (3.9, wikisource:zh)	22m 20s
build (3.10, wikipedia:en)	23m 29s
build (3.10, wikisource:zh)	20m 42s
build (3.11, wikipedia:en)	21m 35s
build (3.11, wikisource:zh)	23m 44s
build (3.12, wikipedia:en)	23m 43s
build (3.12, wikisource:zh)	21m 41s
build (3.13.0-alpha - 3.13.0, wikipedia:en)	49s
build (3.13.0-alpha - 3.13.0, wikisource:zh)	45s
build (3.14-dev, wikipedia:en)	24m 25s
build (3.14-dev, wikisource:zh)	22m 25s
build (3.7, wikipedia:test)	24m 16s
build (3.7, false, wpbeta, en)	23m 32s
build (3.7, false, wpbeta, zh)	22m 30s
build (3.8, wsbeta:en)	20m 18s
build (3.7, wikidata:test)	20m 24s
build (3.9, wiktionary:ar, true)	21m 3s
build (3.7, wikidata:wikidata)	30m 53s
build (3.8, wowwiki:uk)	15m 34s
build (3, wikipedia:de, macOS-latest)	24m 59s
	10h 41m 32s

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