Fix the typos (#7178)

Co-authored-by: Wayne_Yang <[email protected]>

src/main/java/io/reactivex/rxjava3/schedulers/Schedulers.java

@@ -367,7 +367,7 @@ public static Scheduler single() {
      * because such circumstances prevent RxJava from progressing flow-related activities correctly.
      * If the {@link Executor#execute(Runnable)} or {@link ExecutorService#submit(Callable)} throws,
      * the {@code RejectedExecutionException} is routed to the global error handler via
-     * {@link RxJavaPlugins#onError(Throwable)}. To avoid shutdown-reladed problems, it is recommended
+     * {@link RxJavaPlugins#onError(Throwable)}. To avoid shutdown-related problems, it is recommended
      * all flows using the returned {@code Scheduler} to be canceled/disposed before the underlying
      * {@code Executor} is shut down. To avoid problems due to the {@code Executor} having a bounded-queue,
      * it is recommended to rephrase the flow to utilize backpressure as the means to limit outstanding work.
@@ -441,7 +441,7 @@ public static Scheduler from(@NonNull Executor executor) {
      * because such circumstances prevent RxJava from progressing flow-related activities correctly.
      * If the {@link Executor#execute(Runnable)} or {@link ExecutorService#submit(Callable)} throws,
      * the {@code RejectedExecutionException} is routed to the global error handler via
-     * {@link RxJavaPlugins#onError(Throwable)}. To avoid shutdown-reladed problems, it is recommended
+     * {@link RxJavaPlugins#onError(Throwable)}. To avoid shutdown-related problems, it is recommended
      * all flows using the returned {@code Scheduler} to be canceled/disposed before the underlying
      * {@code Executor} is shut down. To avoid problems due to the {@code Executor} having a bounded-queue,
      * it is recommended to rephrase the flow to utilize backpressure as the means to limit outstanding work.
@@ -521,7 +521,7 @@ public static Scheduler from(@NonNull Executor executor, boolean interruptibleWo
      * because such circumstances prevent RxJava from progressing flow-related activities correctly.
      * If the {@link Executor#execute(Runnable)} or {@link ExecutorService#submit(Callable)} throws,
      * the {@code RejectedExecutionException} is routed to the global error handler via
-     * {@link RxJavaPlugins#onError(Throwable)}. To avoid shutdown-reladed problems, it is recommended
+     * {@link RxJavaPlugins#onError(Throwable)}. To avoid shutdown-related problems, it is recommended
      * all flows using the returned {@code Scheduler} to be canceled/disposed before the underlying
      * {@code Executor} is shut down. To avoid problems due to the {@code Executor} having a bounded-queue,
      * it is recommended to rephrase the flow to utilize backpressure as the means to limit outstanding work.