Add throws doc

Author: ZacSweers

src/main/java/io/reactivex/CompletableConverter.java

@@ -28,6 +28,7 @@ public interface CompletableConverter<R> {
      *
      * @param upstream the upstream Completable instance
      * @return the converted value
+     * @throws Exception on error
      */
     @NonNull
     R apply(@NonNull Completable upstream) throws Exception;

src/main/java/io/reactivex/FlowableConverter.java

@@ -29,6 +29,7 @@ public interface FlowableConverter<T, R> {
      *
      * @param upstream the upstream Flowable instance
      * @return the converted value
+     * @throws Exception on error
      */
     @NonNull
     R apply(@NonNull Flowable<T> upstream) throws Exception;

src/main/java/io/reactivex/MaybeConverter.java

@@ -29,6 +29,7 @@ public interface MaybeConverter<T, R> {
      *
      * @param upstream the upstream Maybe instance
      * @return the converted value
+     * @throws Exception on error
      */
     @NonNull
     R apply(@NonNull Maybe<T> upstream) throws Exception;

src/main/java/io/reactivex/ObservableConverter.java

@@ -29,6 +29,7 @@ public interface ObservableConverter<T, R> {
      *
      * @param upstream the upstream Observable instance
      * @return the converted value
+     * @throws Exception on error
      */
     @NonNull
     R apply(@NonNull Observable<T> upstream) throws Exception;

src/main/java/io/reactivex/SingleConverter.java

@@ -29,6 +29,7 @@ public interface SingleConverter<T, R> {
      *
      * @param upstream the upstream Single instance
      * @return the converted value
+     * @throws Exception on error
      */
     @NonNull
     R apply(@NonNull Single<T> upstream) throws Exception;