[ruby/syntax_suggest] Rename lex to token where appropriate #765

Job	Run time
Windows 11-arm/Visual C++ (btest test-basic test-tool)	17m 4s
Windows 2025/Visual C++ 2022 (check)	22m 8s
Windows 2025/Visual C++ 2022 (test-bundled-gems)	20m 7s
Windows 2022/Visual C++ 2022 (check)	23m 56s
Windows result	4s
	1h 23m 19s

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