Fix duplicate links in configuration-guide.adoc (#1247)

Fixes #1245

Is it a duplicate or did someone intend to make the 2nd item point to
the other page?

docs/modules/mapstore/pages/configuration-guide.adoc

@@ -11,7 +11,7 @@ If you use Hazelcast in client/server mode, make sure to add the MapStore to the
 
 To configure a MapStore, you must provide the <<class-name, name>> of your class that implements the MapStore.
 
-NOTE: Follow the instructions in xref:mapstore:configuring-a-generic-maploader.adoc[] or xref:mapstore:configuring-a-generic-maploader.adoc[] for this step if you are using a pre-built Mapstore.
+NOTE: Follow the instructions in xref:mapstore:configuring-a-generic-maploader.adoc[] or xref:mapstore:configuring-a-generic-mapstore.adoc[] for this step if you are using a pre-built Mapstore.
 
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