Revert "revert doc"

It was only a matter of time before this erroneously got merged in.

This reverts commit 05aab1035a.

build.sbt

@@ -18,7 +18,6 @@ ThisBuild / Test / scalafmtOnCompile := !(Global / insideCI).value
 def buildLevelSettings: Seq[Setting[_]] =
   inThisBuild(
     Seq(
-      doc in Compile := file("/dev/null"),
       organization := "org.scala-sbt",
       description := "sbt is an interactive build tool",
       bintrayOrganization := Some("sbt"),
@@ -48,7 +47,6 @@ def buildLevelSettings: Seq[Setting[_]] =
       homepage := Some(url("https://github.com/sbt/sbt")),
       scmInfo := Some(ScmInfo(url("https://github.com/sbt/sbt"), "git@github.com:sbt/sbt.git")),
       resolvers += Resolver.mavenLocal,
-      scalafmtOnCompile := false,
     )
   )
 
@@ -62,7 +60,6 @@ def commonSettings: Seq[Setting[_]] = Def.settings(
        |""".stripMargin
     )
   ),
-  doc in Compile := file("/dev/null"),
   scalaVersion := baseScalaVersion,
   componentID := None,
   resolvers += Resolver.typesafeIvyRepo("releases"),
@@ -396,7 +393,6 @@ lazy val scriptedSbtReduxProj = (project in file("scripted-sbt-redux"))
   .dependsOn(commandProj)
   .settings(
     baseSettings,
-    doc in Compile := file("/dev/null"),
     name := "Scripted sbt Redux",
     libraryDependencies ++= Seq(launcherInterface % "provided"),
     resourceGenerators in Compile += Def task {
@@ -644,7 +640,6 @@ lazy val mainProj = (project in file("main"))
   )
   .settings(
     testedBaseSettings,
-    doc in Compile := file("/dev/null"),
     name := "Main",
     checkPluginCross := {
       val sv = scalaVersion.value