Update the JavaExec Gradle task documentation (#1922)
Update the JavaExec Gradle task documentation (#1922)

This page is using some detekt-cli flags that have been removed.
I'm cleaning it up to make sure it actually works with the
current version of Detekt.
arturbosch/detekt,arturbosch/detekt,rock3r/detekt,rock3r/detekt,rock3r/detekt,arturbosch/detekt