fix typo

Co-authored-by: Lawrence Qiu <[email protected]>

Author: zhumin8

google-api-client-apache-v5/pom.xml

@@ -30,7 +30,7 @@
                         <link>https://docs.oracle.com/javase/8/docs/api/</link>
                         <link>https://cloud.google.com/appengine/docs/standard/java/javadoc/</link>
                         <link>https://cloud.google.com/java/docs/reference/google-http-client/${project.http.version}/</link>
-                        <link>https://cloud.google.com/java/docs/reference/google-oauth-client//${project.oauth.version}/</link>
+                        <link>https://cloud.google.com/java/docs/reference/google-oauth-client/${project.oauth.version}/</link>
                     </links>
                     <doctitle>${project.name} ${project.version}</doctitle>
                     <windowtitle>${project.artifactId} ${project.version}</windowtitle>