Fix typo

Author: jvazquez-r7

modules/exploits/multi/misc/java_jmx_server.rb

@@ -128,7 +128,7 @@ def exploit
       fail_with(Failure::NoTarget, "#{peer} - Failed to negotiate RMI protocol")
     end
 
-    print_status("#{peer} - Discoverig the JMXRMI endpoint...")
+    print_status("#{peer} - Discovering the JMXRMI endpoint...")
     mbean_server = discover_endpoint
     disconnect
     if mbean_server.nil?