Typo fix in User Guide

Signed-off-by: Maxim Nesen <maxim.nesen@oracle.com>

docs/src/main/docbook/rx-client.xml

diff --git a/docs/src/main/docbook/rx-client.xml b/docs/src/main/docbook/rx-client.xml
index db91eef..d1856db 100644
--- a/docs/src/main/docbook/rx-client.xml
+++ b/docs/src/main/docbook/rx-client.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!--
 
-    Copyright (c) 2014, 2020 Oracle and/or its affiliates. All rights reserved.
+    Copyright (c) 2014, 2022 Oracle and/or its affiliates. All rights reserved.
 
     This program and the accompanying materials are made available under the
     terms of the Eclipse Public License v. 2.0, which is available at
@@ -803,7 +803,7 @@
 
             <programlisting language="java" linenumbering="numbered">public static class CompletionStageRxInvokerProvider implements RxInvokerProvider&lt;CompletionStageRxInvoker&gt; {
     @Override
-    public boolean isProviderFor(Class&lt;?%gt; clazz) {
+    public boolean isProviderFor(Class&lt;?&gt; clazz) {
         return CompletionStage.class.equals(clazz);
     }