package/openjdk: fix typo in help text of openjdk zero

Signed-off-by: He Haorui <hehaorui1999@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 9f3e805428302c16769da78ce6604d5db77fbc39)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/openjdk/Config.in

@@ -148,7 +148,7 @@ config BR2_PACKAGE_OPENJDK_JVM_VARIANT_ZERO
 	select BR2_PACKAGE_LIBFFI
 	help
 	  A non-assembler variant with wide arch support, however
-	  performance is less then client/server.
+	  performance is less than client/server.
 
 	  http://openjdk.java.net/projects/zero