add docstr

src/metabase/db.clj

@@ -55,7 +55,10 @@
                          :password (config/config-str :mb-db-pass)
                          :host (config/config-str :mb-db-host)})))
 
-(defn metabase-db-conn-str []
+(defn metabase-db-conn-str
+  "A connection string that can be used when pretending the Metabase DB is itself a `Database`
+   (e.g., to use the Generic SQL driver functions on the Metabase DB itself)."
+  []
   (case (config/config-kw :mb-db-type)
     :h2 (db-file)
     :postgres (format "host=%s port=%d dbname=%s user=%s password=%s"