Update dokka version, fix knowledge task (google#2463)

Co-authored-by: Jing Tang <[email protected]>

buildSrc/src/main/kotlin/Plugins.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 Google LLC
+ * Copyright 2023-2024 Google LLC
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -46,6 +46,6 @@ object Plugins {
   object Versions {
     const val androidGradlePlugin = "8.0.2"
     const val benchmarkPlugin = "1.1.0"
-    const val dokka = "1.7.20"
+    const val dokka = "1.9.20"
   }
 }

knowledge/build.gradle.kts

@@ -121,6 +121,13 @@ tasks.dokkaHtml.configure {
       moduleName.set(Releases.Knowledge.artifactId)
       moduleVersion.set(Releases.Knowledge.version)
       noAndroidSdkLink.set(false)
+      sourceLink {
+        localDirectory.set(file("src/main/java"))
+        remoteUrl.set(
+          URL("https://github.com/google/android-fhir/tree/master/knowledge/src/main/java"),
+        )
+        remoteLineSuffix.set("#L")
+      }
       externalDocumentationLink {
         url.set(URL("https://hapifhir.io/hapi-fhir/apidocs/hapi-fhir-structures-r4/"))
         packageListUrl.set(