Fix a typo in 6.10

Author: dz-cies

06_databases/6-10_connect-to-datomic.asciidoc

@@ -19,7 +19,7 @@ $ lein try com.datomic/datomic-free
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 To create and connect to an in-memory database, use
-+database.api/create-database+ and +datomic.api/connect+:
++datomic.api/create-database+ and +datomic.api/connect+:
 
 [source,clojure]
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