Update some comments to remove "syntax". #1163

Job	Run time
fuzzing_regressions (debug)	4m 33s
sanitizer_testing (address, debug)	2m 23s
fuzzing_regressions (release)	3m 10s
api-breakage	1m 26s
sanitizer_testing (address, release)	5m 23s
core (5.9.2-jammy, ref/heads/main)	7m 50s
sanitizer_testing (thread, debug)	2m 26s
core (5.8.1-jammy, ref/heads/main)	6m 51s
sanitizer_testing (thread, release)	5m 26s
core (5.7.3-jammy, ref/heads/main)	5m 4s
	44m 32s

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