Fix Javadoc Unicode rendering issue with RIGHT SINGLE QUOTATION MARK

buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy

@@ -1424,6 +1424,8 @@ class BeamModulePlugin implements Plugin<Project> {
       // Configures javadoc plugin and ensure check runs javadoc.
       project.tasks.withType(Javadoc) {
         options.encoding = 'UTF-8'
+        options.docEncoding = 'UTF-8'
+        options.charSet = 'UTF-8'
         options.addBooleanOption('Xdoclint:-missing', true)
       }
       project.check.dependsOn project.javadoc

sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaIO.java

@@ -1,4 +1,4 @@
-/*
+/*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information

sdks/java/io/kafka/src/main/java/org/apache/beam/sdk/io/kafka/KafkaReadSchemaTransformConfiguration.java

@@ -1,4 +1,4 @@
-/*
+/*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
@@ -145,7 +145,7 @@ public static Builder builder() {
       "What to do when there is no initial offset in Kafka or if the current offset"
           + " does not exist any more on the server. (1) earliest: automatically reset the offset to the earliest"
           + " offset. (2) latest: automatically reset the offset to the latest offset"
-          + " (3) none: throw exception to the consumer if no previous offset is found for the consumer’s group")
+          + " (3) none: throw exception to the consumer if no previous offset is found for the consumer's group")
   @SchemaFieldNumber("7")
   @Nullable
   public abstract String getAutoOffsetResetConfig();

sdks/java/javadoc/build.gradle

@@ -77,6 +77,9 @@ task aggregateJavadoc(type: Javadoc) {
   options.with {
     title "Apache Beam " + project.version
     overview 'overview.html'
+    encoding 'UTF-8'
+    docEncoding 'UTF-8'
+    charSet 'UTF-8'
     for (dep in project.library.java.values()) {
       links createJavadocIOUrlForDependency(dep)
     }