Fixes doc warnings

Author: Josh Deffibaugh

event-handler/src/main/java/com/optimizely/ab/android/event_handler/EventIntentService.java

@@ -51,7 +51,7 @@ public EventIntentService() {
 
     /**
      * @hide
-     * @see @link IntentService#onCreate()
+     * @see IntentService#onCreate()
      */
     @Override
     public void onCreate() {

event-handler/src/main/java/com/optimizely/ab/android/event_handler/OptlyEventHandler.java

@@ -48,6 +48,7 @@ private OptlyEventHandler(@NonNull Context context) {
      * Gets a new instance
      *
      * @param context any valid Android {@link Context}
+     * @return a new instance of {@link OptlyEventHandler}
      */
     public static OptlyEventHandler getInstance(@NonNull Context context) {
         return new OptlyEventHandler(context);

shared/src/main/java/com/optimizely/ab/android/shared/Cache.java

@@ -54,7 +54,7 @@ public Cache(@NonNull Context context, @NonNull Logger logger) {
      *
      * @param fileName the path to the file
      * @return the loaded cache file as String
-     * @throws IOException
+     * @throws IOException if file can't be loaded
      * @hide
      */
     @NonNull
@@ -105,7 +105,7 @@ public boolean exists(String fileName) {
      * @param fileName the path to the file
      * @param data the String data to write to the file
      * @return true if the file was saved
-     * @throws IOException
+     * @throws IOException if file can't be saved
      * @hide
      */
     public boolean save(String fileName, String data) throws IOException {

shared/src/main/java/com/optimizely/ab/android/shared/Client.java

@@ -56,7 +56,7 @@ public Client(@NonNull OptlyStorage optlyStorage, @NonNull Logger logger) {
      *
      * @param url a {@link URL} instance
      * @return an open {@link HttpURLConnection}
-     * @throws IOException
+     * @throws IOException if connection can't be opened
      * @hide
      */
     public HttpURLConnection openConnection(URL url) throws IOException {