2.x: Fix typo in Single + Maybe defer() (#4560)

Author: vanniktech

src/main/java/io/reactivex/Maybe.java

@@ -461,7 +461,7 @@ public static <T> Maybe<T> create(MaybeOnSubscribe<T> onSubscribe) {
 
     /**
      * Calls a Callable for each individual MaybeObserver to return the actual MaybeSource source to
-     * be subscribe to.
+     * be subscribed to.
      * <dl>
      * <dt><b>Scheduler:</b></dt>
      * <dd>{@code defer} does not operate by default on a particular {@link Scheduler}.</dd>

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

@@ -348,7 +348,7 @@ public static <T> Single<T> create(SingleOnSubscribe<T> source) {
 
     /**
      * Calls a Callable for each individual SingleObserver to return the actual Single source to
-     * be subscribe to.
+     * be subscribed to.
      * <dl>
      * <dt><b>Scheduler:</b></dt>
      * <dd>{@code defer} does not operate by default on a particular {@link Scheduler}.</dd>