Use @linkplain instead of <a href="...">.

On the one hand, I suppose it was kind of cool to advertise the "[https://guava.dev/CacheBuilder](guava.dev/CacheBuilder)" style of link. On the other hand, we normally use `@link` and `@linkplain` when we can: They keep you within the current version of Javadoc (including keeping you looking at local files in your IDE if you're doing that). (They also prevent the Javadoc tool from generating a little "This is an external link" icon (new sometime between Java 11 and Java 21) in its output. That's how I noticed these surprisingly "external" links.)

RELNOTES=n/a
PiperOrigin-RevId: 711799401

Author: cpovirk

android/guava/src/com/google/common/cache/package-info.java

@@ -13,7 +13,7 @@
  */
 
 /**
- * <a href="https://guava.dev/CacheBuilder">Discouraged</a> (in favor of <a
+ * {@linkplain CacheBuilder Discouraged} (in favor of <a
  * href="https://github.com/ben-manes/caffeine/wiki">Caffeine</a>) caching utilities.
  *
  * <p>The core interface used to represent caches is {@link Cache}. In-memory caches can be

android/guava/src/com/google/common/eventbus/package-info.java

@@ -13,8 +13,8 @@
  */
 
 /**
- * <a href="https://guava.dev/EventBus">Discouraged</a> in favor of dependency injection and
- * concurrency frameworks, EventBus allows publish-subscribe-style communication.
+ * {@linkplain EventBus Discouraged} in favor of dependency injection and concurrency frameworks,
+ * EventBus allows publish-subscribe-style communication.
  *
  * <p>See the Guava User Guide article on <a
  * href="https://github.com/google/guava/wiki/EventBusExplained">{@code EventBus}</a>.

guava/src/com/google/common/cache/package-info.java

@@ -13,7 +13,7 @@
  */
 
 /**
- * <a href="https://guava.dev/CacheBuilder">Discouraged</a> (in favor of <a
+ * {@linkplain CacheBuilder Discouraged} (in favor of <a
  * href="https://github.com/ben-manes/caffeine/wiki">Caffeine</a>) caching utilities.
  *
  * <p>The core interface used to represent caches is {@link Cache}. In-memory caches can be

guava/src/com/google/common/eventbus/package-info.java

@@ -13,8 +13,8 @@
  */
 
 /**
- * <a href="https://guava.dev/EventBus">Discouraged</a> in favor of dependency injection and
- * concurrency frameworks, EventBus allows publish-subscribe-style communication.
+ * {@linkplain EventBus Discouraged} in favor of dependency injection and concurrency frameworks,
+ * EventBus allows publish-subscribe-style communication.
  *
  * <p>See the Guava User Guide article on <a
  * href="https://github.com/google/guava/wiki/EventBusExplained">{@code EventBus}</a>.