Single error operators marbles (#6086)

* Add marbles for Single.error operators

* Add marbles for Single.onError operators

* Use proper URLs for marble diagrams

Author: UMFsimke

src/main/java/io/reactivex/Single.java

@@ -507,6 +507,8 @@ public static <T> Single<T> defer(final Callable<? extends SingleSource<? extend
 
     /**
      * Signals a Throwable returned by the callback function for each individual SingleObserver.
+     * <p>
+     * <img width="640" height="283" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.error.c.png" alt="">
      * <dl>
      * <dt><b>Scheduler:</b></dt>
      * <dd>{@code error} does not operate by default on a particular {@link Scheduler}.</dd>
@@ -527,7 +529,7 @@ public static <T> Single<T> error(final Callable<? extends Throwable> errorSuppl
      * Returns a Single that invokes a subscriber's {@link SingleObserver#onError onError} method when the
      * subscriber subscribes to it.
      * <p>
-     * <img width="640" height="190" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.error.png" alt="">
+     * <img width="640" height="283" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.error.png" alt="">
      * <dl>
      * <dt><b>Scheduler:</b></dt>
      * <dd>{@code error} does not operate by default on a particular {@link Scheduler}.</dd>
@@ -2921,7 +2923,7 @@ public final Single<T> observeOn(final Scheduler scheduler) {
      * Instructs a Single to emit an item (returned by a specified function) rather than invoking
      * {@link SingleObserver#onError onError} if it encounters an error.
      * <p>
-     * <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorReturn.png" alt="">
+     * <img width="640" height="451" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorReturn.png" alt="">
      * <p>
      * By default, when a Single encounters an error that prevents it from emitting the expected item to its
      * subscriber, the Single invokes its subscriber's {@link SingleObserver#onError} method, and then quits
@@ -2952,6 +2954,8 @@ public final Single<T> onErrorReturn(final Function<Throwable, ? extends T> resu
 
     /**
      * Signals the specified value as success in case the current Single signals an error.
+     * <p>
+     * <img width="640" height="451" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorReturnItem.png" alt="">
      * <dl>
      * <dt><b>Scheduler:</b></dt>
      * <dd>{@code onErrorReturnItem} does not operate by default on a particular {@link Scheduler}.</dd>
@@ -2971,7 +2975,7 @@ public final Single<T> onErrorReturnItem(final T value) {
      * Instructs a Single to pass control to another Single rather than invoking
      * {@link SingleObserver#onError(Throwable)} if it encounters an error.
      * <p>
-     * <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/onErrorResumeNext.png" alt="">
+     * <img width="640" height="451" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorResumeNext.png" alt="">
      * <p>
      * By default, when a Single encounters an error that prevents it from emitting the expected item to
      * its {@link SingleObserver}, the Single invokes its SingleObserver's {@code onError} method, and then quits
@@ -3005,7 +3009,7 @@ public final Single<T> onErrorResumeNext(final Single<? extends T> resumeSingleI
      * Instructs a Single to pass control to another Single rather than invoking
      * {@link SingleObserver#onError(Throwable)} if it encounters an error.
      * <p>
-     * <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/onErrorResumeNext.png" alt="">
+     * <img width="640" height="451" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/Single.onErrorResumeNext.f.png" alt="">
      * <p>
      * By default, when a Single encounters an error that prevents it from emitting the expected item to
      * its {@link SingleObserver}, the Single invokes its SingleObserver's {@code onError} method, and then quits