Fix markdown (openhab#2004)

Signed-off-by: Jerome Luckenbach <[email protected]>

configuration/persistence.md

@@ -88,7 +88,7 @@ where `<itemlist>` is a comma-separated list consisting of one or more of the fo
   Note that `*` is NOT a wildcard match character in this context.
 
 The entries are additive.
-This means if one Item appears in more than one `<itemlist>` either directly or indirectly (e.g. `*` which includes all Items or as a member of a Group used in `<groupName>*`), all the strategies strategies listed on all those lines apply to that Item. 
+This means if one Item appears in more than one `<itemlist>` either directly or indirectly (e.g. `*` which includes all Items or as a member of a Group used in `<groupName>*`), all the strategies strategies listed on all those lines apply to that Item.
 
 Below you will find a complete example persistence configuration file: