Avoid showing private methods for external references #11288

Job	Run time
Ruby 3.1 on ubuntu-latest	16m 11s
Ruby 3.2 on ubuntu-latest	14m 35s
lint_ruby	32s
lint_node	34s
build_node (ubuntu-latest)	1m 23s
Ruby 3.3 on ubuntu-latest	11m 48s
build_node (macos-latest)	1m 22s
Ruby 3.1 on macos-latest	8m 51s
build_node (windows-latest)	6m 37s
Verify Jekyll website builds	8s
Ruby 3.2 on macos-latest	7m 44s
spelling	19s
Ruby 3.3 on macos-latest	7m 23s
Ruby 3.1 on windows-latest	20m 45s
Ruby 3.2 on windows-latest	21m 26s
Ruby 3.3 on windows-latest	22m 19s
	2h 21m 57s

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