docs: fix off-by-one hl_lines in apps.md (#3196) #3712

Job	Run time
checks / docs	57s
checks / readme-snippets	14s
checks / pre-commit	53s
checks / test (3.10, locked, windows-latest)	2m 2s
checks / test (3.12, locked, windows-latest)	1m 52s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 30s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.11, locked, ubuntu-latest)	1m 22s
checks / test (3.11, lowest-direct, windows-latest)	1m 55s
checks / test (3.12, locked, ubuntu-latest)	1m 42s
checks / test (3.10, lowest-direct, windows-latest)	1m 50s
checks / test (3.10, locked, ubuntu-latest)	1m 38s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.13, locked, windows-latest)	1m 45s
checks / test (3.13, locked, ubuntu-latest)	1m 14s
checks / test (3.12, lowest-direct, windows-latest)	1m 51s
checks / test (3.11, locked, windows-latest)	2m 2s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.14, lowest-direct, windows-latest)	1m 59s
checks / test (3.13, lowest-direct, windows-latest)	1m 54s
checks / test (3.14, locked, windows-latest)	2m 20s
checks / test (3.14, locked, ubuntu-latest)	1m 4s
all-green	3s
	35m 18s

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