docs: use KDoc syntax for kotlin (#193)

Signed-off-by: Mike Schore <mike.schore@gmail.com>
Signed-off-by: JP Simard <jp@jpsim.com>

mobile/library/kotlin/io/envoyproxy/envoymobile/Envoy.kt

@@ -3,7 +3,9 @@ package io.envoyproxy.envoymobile
 import android.content.Context
 import io.envoyproxy.envoymobile.engine.EnvoyEngine
 
-// Wrapper class that allows for easy calling of Envoy's JNI interface in native Java.
+/**
+ * Wrapper class that allows for easy calling of Envoy's JNI interface in native Java.
+ */
 class Envoy @JvmOverloads constructor(
     context: Context,
     config: String,
@@ -13,10 +15,12 @@ class Envoy @JvmOverloads constructor(
   // Dedicated thread for running this instance of Envoy.
   private val runner: Thread
 
-  // Create a new Envoy instance. The Envoy runner Thread is started as part of instance
-  // initialization with the configuration provided. If the Envoy native library and its
-  // dependencies haven't been loaded and initialized yet, this will happen lazily when
-  // the first instance is created.
+  /**
+   * Create a new Envoy instance. The Envoy runner Thread is started as part of instance
+   * initialization with the configuration provided. If the Envoy native library and its
+   * dependencies haven't been loaded and initialized yet, this will happen lazily when
+   * the first instance is created.
+   */
   init {
     // Lazily initialize Envoy and its dependencies, if necessary.
     load(context)
@@ -28,13 +32,17 @@ class Envoy @JvmOverloads constructor(
     runner.start()
   }
 
-  // Returns whether the Envoy instance is currently active and running.
+  /**
+   * Returns whether the Envoy instance is currently active and running.
+   */
   fun isRunning(): Boolean {
     val state = runner.state
     return state != Thread.State.NEW && state != Thread.State.TERMINATED
   }
 
-  // Returns whether the Envoy instance is terminated.
+  /**
+   * Returns whether the Envoy instance is terminated.
+   */
   fun isTerminated(): Boolean {
     return runner.state == Thread.State.TERMINATED
   }