fix dokka output dir

Author: aallam

build.gradle.kts

@@ -30,7 +30,3 @@ subprojects {
         }
     }
 }
-
-tasks.withType<DokkaMultiModuleTask>() {
-    outputDirectory.set(projectDir.resolve("docs"))
-}

string-similarity/build.gradle.kts

@@ -82,3 +82,7 @@ kotlin {
         }
     }
 }
+
+tasks.dokkaHtml.configure {
+    outputDirectory.set(rootDir.resolve("docs"))
+}