Change javadoc explanation for Mutable List (#6314)

Author: punitda

src/main/java/io/reactivex/Flowable.java

@@ -8746,7 +8746,7 @@ public final <K> Flowable<T> distinct(Function<? super T, K> keySelector,
      * {@code CharSequence}s or {@code List}s where the objects will actually have the same
      * references when they are modified and {@code distinctUntilChanged} will evaluate subsequent items as same.
      * To avoid such situation, it is recommended that mutable data is converted to an immutable one,
-     * for example using `map(CharSequence::toString)` or `map(Collections::unmodifiableList)`.
+     * for example using `map(CharSequence::toString)` or `map(list -> Collections.unmodifiableList(new ArrayList<>(list)))`.
      * <dl>
      *  <dt><b>Backpressure:</b></dt>
      *  <dd>The operator doesn't interfere with backpressure which is determined by the source {@code Publisher}'s
@@ -8789,7 +8789,7 @@ public final Flowable<T> distinctUntilChanged() {
      * {@code CharSequence}s or {@code List}s where the objects will actually have the same
      * references when they are modified and {@code distinctUntilChanged} will evaluate subsequent items as same.
      * To avoid such situation, it is recommended that mutable data is converted to an immutable one,
-     * for example using `map(CharSequence::toString)` or `map(Collections::unmodifiableList)`.
+     * for example using `map(CharSequence::toString)` or `map(list -> Collections.unmodifiableList(new ArrayList<>(list)))`.
      * <dl>
      *  <dt><b>Backpressure:</b></dt>
      *  <dd>The operator doesn't interfere with backpressure which is determined by the source {@code Publisher}'s
@@ -8828,7 +8828,7 @@ public final <K> Flowable<T> distinctUntilChanged(Function<? super T, K> keySele
      * {@code CharSequence}s or {@code List}s where the objects will actually have the same
      * references when they are modified and {@code distinctUntilChanged} will evaluate subsequent items as same.
      * To avoid such situation, it is recommended that mutable data is converted to an immutable one,
-     * for example using `map(CharSequence::toString)` or `map(Collections::unmodifiableList)`.
+     * for example using `map(CharSequence::toString)` or `map(list -> Collections.unmodifiableList(new ArrayList<>(list)))`.
      * <dl>
      *  <dt><b>Backpressure:</b></dt>
      *  <dd>The operator doesn't interfere with backpressure which is determined by the source {@code Publisher}'s

src/main/java/io/reactivex/Observable.java

@@ -7830,7 +7830,7 @@ public final <K> Observable<T> distinct(Function<? super T, K> keySelector, Call
      * {@code CharSequence}s or {@code List}s where the objects will actually have the same
      * references when they are modified and {@code distinctUntilChanged} will evaluate subsequent items as same.
      * To avoid such situation, it is recommended that mutable data is converted to an immutable one,
-     * for example using `map(CharSequence::toString)` or `map(Collections::unmodifiableList)`.
+     * for example using `map(CharSequence::toString)` or `map(list -> Collections.unmodifiableList(new ArrayList<>(list)))`.
      * <dl>
      *  <dt><b>Scheduler:</b></dt>
      *  <dd>{@code distinctUntilChanged} does not operate by default on a particular {@link Scheduler}.</dd>
@@ -7869,7 +7869,7 @@ public final Observable<T> distinctUntilChanged() {
      * {@code CharSequence}s or {@code List}s where the objects will actually have the same
      * references when they are modified and {@code distinctUntilChanged} will evaluate subsequent items as same.
      * To avoid such situation, it is recommended that mutable data is converted to an immutable one,
-     * for example using `map(CharSequence::toString)` or `map(Collections::unmodifiableList)`.
+     * for example using `map(CharSequence::toString)` or `map(list -> Collections.unmodifiableList(new ArrayList<>(list)))`.
      * <dl>
      *  <dt><b>Scheduler:</b></dt>
      *  <dd>{@code distinctUntilChanged} does not operate by default on a particular {@link Scheduler}.</dd>
@@ -7904,7 +7904,7 @@ public final <K> Observable<T> distinctUntilChanged(Function<? super T, K> keySe
      * {@code CharSequence}s or {@code List}s where the objects will actually have the same
      * references when they are modified and {@code distinctUntilChanged} will evaluate subsequent items as same.
      * To avoid such situation, it is recommended that mutable data is converted to an immutable one,
-     * for example using `map(CharSequence::toString)` or `map(Collections::unmodifiableList)`.
+     * for example using `map(CharSequence::toString)` or `map(list -> Collections.unmodifiableList(new ArrayList<>(list)))`.
      * <dl>
      *  <dt><b>Scheduler:</b></dt>
      *  <dd>{@code distinctUntilChanged} does not operate by default on a particular {@link Scheduler}.</dd>