Update 'Readme.md'

Readme.md

@@ -52,7 +52,7 @@ CREATE EXTENSION pljava;
 ```
 
 Apply ACLs
-``
+```
 GRANT USAGE ON LANGUAGE java TO pljavarole;
 ALTER DATABASE pljavadb SET pljava.libjvm_location TO '/usr/lib/jvm/java-11-openjdk-arm64/lib/server/libjvm.so';
 ```