Spell "XPath" in its usual spelling

Change-Id: I753f9396c349b92bfef7a8c6a93b5c97501f9b03
diff --git a/src/datastore_access.cpp b/src/datastore_access.cpp
index 6e3b37a..9ca931f 100644
--- a/src/datastore_access.cpp
+++ b/src/datastore_access.cpp
@@ -24,7 +24,7 @@
         m_what += it.message;
         m_what += "\n";
         if (it.xpath) {
-            m_what += " Xpath: ";
+            m_what += " XPath: ";
             m_what += it.xpath.value();
             m_what += "\n";
         }