Add note about @ModularizedFixture in "not known type error"

[pau1adam]

We should add a note to

fixtures/fixtures-processor/src/main/kotlin/com/theblueground/fixtures/ProcessedParameterMapper.kt

Lines 72 to 74 in 7af2b3f

	else -> throw IllegalArgumentException(
	"${parameterType.toClassName().simpleName} is not a known type and no related @FixtureAdapter was found",
	)

that says that if the fixture exists in a different module adding @ModularizedFixture to the property will allow the build to continue.