Fix minor type on OGM getting started guide

Author: emmanuelbernard

ogm/documentation/getting-started.adoc

@@ -148,7 +148,7 @@ Create a [filename]+META-INF/persistence.xml+ file.
 <?xml version="1.0"?>
 <persistence xmlns="http://java.sun.com/xml/ns/persistence"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.  com/xml/ns/persistence/persistence_2_0.xsd"
+             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
              version="2.0">
 
     <persistence-unit name="ogm-jpa-tutorial" transaction-type="JTA">
@@ -215,7 +215,9 @@ tm.commit();
 
 emf.close();
 
-public static TransactionManager getTransactionManager() throws Exception
+private static final String JBOSS_TM_CLASS_NAME = "com.arjuna.ats.jta.TransactionManager";
+
+public static TransactionManager getTransactionManager() throws Exception {
     Class<?> tmClass = Main.class.getClassLoader().loadClass(JBOSS_TM_CLASS_NAME);
     return (TransactionManager) tmClass.getMethod("transactionManager").invoke(null);
 }