Clarify symbol search explanation for VS Code #11219

Job	Run time
build_node (ubuntu-latest)	1m 28s
lint_node	30s
build_node (macos-latest)	1m 34s
lint_ruby	21s
build_node (windows-latest)	7m 29s
spelling	15s
Ruby 3.1 on ubuntu-latest	14m 34s
Ruby 3.2 on ubuntu-latest	14m 11s
Verify Jekyll website builds	7s
Ruby 3.3 on ubuntu-latest	9m 51s
Ruby 3.1 on macos-latest	9m 57s
Ruby 3.2 on macos-latest	8m 42s
Ruby 3.3 on macos-latest	7m 27s
Ruby 3.1 on windows-latest	21m 15s
Ruby 3.2 on windows-latest	20m 23s
Ruby 3.3 on windows-latest	24m 54s
	2h 22m 58s

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