Correct allJavadoc task.

Author: smillst

build.gradle

@@ -204,17 +204,15 @@ task allJavadoc(type: Javadoc, group: "Documentation") {
     description = 'Generates a global API documentation for all the modules'
     dependsOn(':checker:shadowJar')
     dependsOn(':util:tagletClasses')
-    doLast {
-        source(project(':checker').sourceSets.main.allJava, project(':framework').sourceSets.main.allJava,
-                project(':dataflow').sourceSets.main.allJava, project(':javacutil').sourceSets.main.allJava)
-
-        classpath = files(subprojects.collect { it.sourceSets.main.compileClasspath })
-        destinationDir = file("${projectDir}/docs/api")
-        copy {
-            from 'docs/logo/Checkmark/CFCheckmark_favicon.png'
-            rename('CFCheckmark_favicon.png', 'favicon-checkerframework.png')
-            into 'docs/api/'
-        }
+    destinationDir = file("${rootDir}/docs/api")
+    source(project(':checker').sourceSets.main.allJava, project(':framework').sourceSets.main.allJava,
+            project(':dataflow').sourceSets.main.allJava, project(':javacutil').sourceSets.main.allJava)
+
+    classpath = files(subprojects.collect { it.sourceSets.main.compileClasspath })
+    copy {
+        from 'docs/logo/Checkmark/CFCheckmark_favicon.png'
+        rename('CFCheckmark_favicon.png', 'favicon-checkerframework.png')
+        into "${rootDir}/docs/api"
     }
 }