Fix 2 ErrorProneStyle findings:

* @Reason is not a TYPE_USE annotation, so should appear before any modifiers and after Javadocs.
  (see go/java-style#s4.8.5-annotations)
* Curly braces should be used for inline Javadoc tags: {@code ...}
  (see http://go/bugpattern/InvalidInlineTag)

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#codehealth

PiperOrigin-RevId: 404769260

Author: ojw28

library/core/src/main/java/com/google/android/exoplayer2/source/ClippingMediaSource.java

@@ -57,7 +57,7 @@ public static final class IllegalClippingException extends IOException {
     public static final int REASON_START_EXCEEDS_END = 2;
 
     /** The reason clipping failed. */
-    public final @Reason int reason;
+    @Reason public final int reason;
 
     /** @param reason The reason clipping failed. */
     public IllegalClippingException(@Reason int reason) {

library/core/src/main/java/com/google/android/exoplayer2/source/SinglePeriodTimeline.java

@@ -147,7 +147,7 @@ public SinglePeriodTimeline(
    * @param isDynamic Whether the window may change when the timeline is updated.
    * @param useLiveConfiguration Whether the window is live and {@link MediaItem#liveConfiguration}
    *     is used to configure live playback behaviour.
-   * @param manifest The manifest. May be (@code null}.
+   * @param manifest The manifest. May be {@code null}.
    * @param mediaItem A media item used for {@link Timeline.Window#mediaItem}.
    */
   public SinglePeriodTimeline(