remove existing author tags and add a note that we don't use them (#2998

)

CONTRIBUTING.md

@@ -110,6 +110,7 @@ It does not support all required rules, so you still have to run `spotlessApply`
   Javadoc, though the style of documentation is up to the author.
 * Try to do the least amount of change when modifying existing documentation.
   Don't change the style unless you have a good reason.
+* We do not use `@author` tags in our javadoc.
 * Our javadoc is available via [javadoc.io}(https://javadoc.io/doc/io.opentelemetry/opentelemetry-api)
 
 ### AutoValue

opentracing-shim/src/test/java/io/opentelemetry/opentracingshim/testbed/actorpropagation/ActorPropagationTest.java

@@ -31,8 +31,6 @@
  *
  * <p>For improved readability, ignore the phaser lines as those are there to ensure deterministic
  * execution for the tests without sleeps.
- *
- * @author tylerbenson
  */
 @SuppressWarnings("FutureReturnValueIgnored")
 class ActorPropagationTest {

opentracing-shim/src/test/java/io/opentelemetry/opentracingshim/testbed/promisepropagation/PromisePropagationTest.java

@@ -31,8 +31,6 @@
  *
  * <p>For improved readability, ignore the phaser lines as those are there to ensure deterministic
  * execution for the tests without sleeps.
- *
- * @author tylerbenson
  */
 class PromisePropagationTest {
   @RegisterExtension

opentracing-shim/src/test/java/io/opentelemetry/opentracingshim/testbed/suspendresumepropagation/SuspendResumePropagationTest.java

@@ -20,8 +20,6 @@
 /**
  * These tests are intended to simulate the kind of async models that are common in java async
  * frameworks.
- *
- * @author tylerbenson
  */
 class SuspendResumePropagationTest {
   @RegisterExtension