docs: fix misleading docs on code with line numbers (#1349) #43

Job	Run time
Validate HTML (3.2)	42s
Build (jekyll gem) (3.9, ubuntu-latest, 3.0)	23s
Build (jekyll gem) (3.9, ubuntu-latest, 3.1)	27s
Build (github-pages gem)	32s
Build (jekyll gem) (3.9, ubuntu-latest, 3.2)	27s
Test CSS and JS (18.x)	11s
Build (jekyll gem) (3.9, macos-latest, 3.0)	1m 11s
Build (jekyll gem) (3.9, macos-latest, 3.1)	1m 5s
Build (jekyll gem) (3.9, macos-latest, 3.2)	41s
Build (jekyll gem) (3.9, windows-latest, 3.0)	1m 30s
Build (jekyll gem) (3.9, windows-latest, 3.1)	2m 19s
Build (jekyll gem) (3.9, windows-latest, 3.2)	3m 58s
Build (jekyll gem) (4.3, ubuntu-latest, 3.0)	21s
Build (jekyll gem) (4.3, ubuntu-latest, 3.1)	20s
Build (jekyll gem) (4.3, ubuntu-latest, 3.2)	22s
Build (jekyll gem) (4.3, macos-latest, 3.0)	1m 27s
Build (jekyll gem) (4.3, macos-latest, 3.1)	1m 6s
Build (jekyll gem) (4.3, macos-latest, 3.2)	43s
Build (jekyll gem) (4.3, windows-latest, 3.0)	1m 33s
Build (jekyll gem) (4.3, windows-latest, 3.1)	2m 22s
Build (jekyll gem) (4.3, windows-latest, 3.2)	3m 24s
	25m 4s

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