remove the duplicate javadoc task from gradle release scripts

tools/release/android/release.template.gradle

@@ -3,15 +3,6 @@ task sourcesJar(type: Jar) {
     from android.sourceSets.main.java.srcDirs
 }
 
-task javadoc(type: Javadoc) {
-    title = 'FFmpegKit'
-    destinationDir = file("${projectDir}/../../docs/android/javadoc")
-    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
-    source = android.sourceSets.main.java.srcDirs
-    configurations.implementation.setCanBeResolved(true)
-    classpath += configurations.implementation
-}
-
 task javadocJar(type: Jar, dependsOn: javadoc) {
     archiveClassifier.set('javadoc')
     from javadoc.destinationDir