Disable javadoc for undocumented sdks. (#3738)

Author: vkryachko

firebase-appdistribution/firebase-appdistribution.gradle

@@ -16,6 +16,10 @@ plugins {
     id 'firebase-library'
 }
 
+firebaseLibrary {
+    publishJavadoc = false
+}
+
 android {
     compileSdkVersion project.targetSdkVersion
 
@@ -58,4 +62,4 @@ dependencies {
     annotationProcessor 'com.google.auto.value:auto-value:1.6.5'
     implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation "androidx.browser:browser:1.3.0"
-}
+}

firebase-messaging-directboot/firebase-messaging-directboot.gradle

@@ -18,6 +18,7 @@ plugins {
 
 firebaseLibrary {
     testLab.enabled = false
+    publishJavadoc = false
     releaseWith project(':firebase-messaging')
 }
 
@@ -68,4 +69,4 @@ dependencies {
     implementation 'com.google.firebase:firebase-measurement-connector:18.0.0'
     implementation "com.google.firebase:firebase-iid-interop:17.0.0"
     implementation "com.google.errorprone:error_prone_annotations:2.9.0"
-}
+}