Refresh refcache and fix broken external links into Java API (#2954)

Author: chalin

.htmltest.yml

@@ -20,6 +20,7 @@ IgnoreURLs: # list of regexs of paths or URLs to be ignored
 
   - ^https://(www\.)?linkedin\.com\b # Always yields 999 Request Denied
   - ^https://(www\.)?mvnrepository\.com # Always yields 403 Forbidden
+  - ^https://twitter.com # Always yields 403 Forbidden
 
   # Ignore Docsy-generated GitHub links:
   - ^https?://github\.com/.*?/.*?/(new|edit)/ # view-page, edit-source etc

content/en/community/end-user/otel-in-practice.md

@@ -23,5 +23,5 @@ in the
 of the [CNCF Slack](https://slack.cncf.io).
 
 Join the
-[OpenTelemetry in Practice Meetup Group](https://meetup.com/opentelemetry-in-practice-meetup-group)
+[OpenTelemetry in Practice Meetup Group](https://www.meetup.com/opentelemetry-in-practice-meetup-group/)
 to get invited to our next talk!

content/en/docs/instrumentation/java/automatic/annotations.md

@@ -66,8 +66,8 @@ types listed below, then the span will not be ended until the future completes.
 - [java.util.concurrent.CompletionStage](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html)
 - [com.google.common.util.concurrent.ListenableFuture](https://guava.dev/releases/10.0/api/docs/com/google/common/util/concurrent/ListenableFuture.html)
 - [org.reactivestreams.Publisher](https://www.reactive-streams.org/reactive-streams-1.0.1-javadoc/org/reactivestreams/Publisher.html)
-- [reactor.core.publisher.Mono](https://projectreactor.io/docs/core/3.1.0.RELEASE/api/reactor/core/publisher/Mono.html)
-- [reactor.core.publisher.Flux](https://projectreactor.io/docs/core/3.1.0.RELEASE/api/reactor/core/publisher/Flux.html)
+- [reactor.core.publisher.Mono](https://projectreactor.io/docs/core/release/api/reactor/core/publisher/Mono.html)
+- [reactor.core.publisher.Flux](https://projectreactor.io/docs/core/release/api/reactor/core/publisher/Flux.html)
 - [io.reactivex.Completable](https://reactivex.io/RxJava/2.x/javadoc/index.html?io/reactivex/Completable.html)
 - [io.reactivex.Maybe](https://reactivex.io/RxJava/2.x/javadoc/index.html?io/reactivex/Maybe.html)
 - [io.reactivex.Single](https://reactivex.io/RxJava/2.x/javadoc/index.html?io/reactivex/Single.html)