docs: fix task name for scaladoc/testOnly #250

Job	Run time
scala-library-nonbootstrapped	2m 7s
scala3-library-bootstrapped	5m 5s
scala3-library-nonbootstrapped	2m 17s
scala3-staging	6m 46s
scala3-compiler-nonbootstrapped	3m 59s
scala3-tasty-inspector	6m 47s
test-scala3-sbt-bridge-nonbootstrapped	4m 56s
test-scala3-sbt-bridge-bootstrapped	6m 42s
scala3-sbt-bridge-nonbootstrapped	4m 0s
tasty-core-nonbootstrapped	2m 29s
test-tasty-core-nonbootstrapped	2m 15s
scala3-compiler-bootstrapped	6m 25s
test-tasty-core-bootstrapped	4m 59s
tasty-core-bootstrapped	5m 15s
scala3-sbt-bridge-bootstrapped	7m 12s
scala-library-cc	5m 36s
scala-library-bootstrapped	5m 13s
	1h 22m 3s

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