fix: allow to omit region name in endregion tag in code snippets (#1908) #1188

Job	Run time
pack	1m 10s
test (ubuntu-latest, npm, true)	3m 0s
test (ubuntu-latest, npm, false)	2m 44s
test (ubuntu-latest, pnpm, true)	2m 3s
test (ubuntu-latest, pnpm, false)	2m 4s
test (windows-latest, npm, true)	8m 15s
test (windows-latest, npm, false)	6m 11s
test (windows-latest, pnpm, true)	8m 20s
test (windows-latest, pnpm, false)	4m 12s
	37m 59s

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