javaunohelper: fix javadoc error: unknown tag: returns

Change-Id: I2cd47bd928da322be6c392d65d2a04152553fbef
Reviewed-on: https://gerrit.libreoffice.org/11246Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>

javaunohelper/com/sun/star/lib/uno/adapter/XInputStreamToInputStreamAdapter.java

@@ -184,7 +184,7 @@ public class XInputStreamToInputStreamAdapter extends InputStream {
     *  The markSupported method of
     *  <code>XInputStreamToInputStreamAdapter</code> returns false.
     *
-    *  @returns  false
+    *  @return  false
     */
     @Override
     public boolean markSupported() {