Remove unresolved Javadoc links

Author: dmdashenkov

datastore/src/main/java/io/spine/server/storage/datastore/type/AbstractDatastoreColumnType.java

@@ -39,7 +39,7 @@ public abstract class AbstractDatastoreColumnType<J, C> implements DatastoreColu
     /**
      * {@inheritDoc}
      *
-     * <p>Delegates the call to the Datastore-native {@link BaseEntity.Builder#setNull setNull}.
+     * <p>Delegates the call to the Datastore-native {@code setNull}.
      */
     @Override
     public void setNull(BaseEntity.Builder<Key, Entity.Builder> storageRecord,

datastore/src/main/java/io/spine/server/storage/datastore/type/DatastoreColumnType.java

@@ -30,7 +30,7 @@
 /**
  * The contract of a {@link ColumnType} used by the Datastore storage.
  *
- * <p>Uses {@link Entity.Builder} as the record type and {@code String} as
+ * <p>Uses {@code Entity.Builder} as the record type and {@code String} as
  * the column identifier type.
  */
 @SPI

stackdriver-trace/src/main/java/io/spine/server/trace/stackdriver/SignalSpan.java

@@ -47,9 +47,8 @@
  * is tracked and represented with a span so that each message handler invocation is converted into
  * a single span.
  *
- * <p>The exception from the span-per-handler rule is
- * an {@linkplain io.spine.server.aggregate.Apply event applier} invocation, which is treated as
- * a part of the respective command handler or event reactor.
+ * <p>The exception from the span-per-handler rule is an event applier invocation, which is treated
+ * as a part of the respective command handler or event reactor.
  */
 @SuppressWarnings("WeakerAccess") // Allows customization via subclassing.
 public class SignalSpan {