Spelling fixes

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Closes strongswan/strongswan#164.

src/libstrongswan/database/database.h

@@ -15,7 +15,7 @@
  */
 
 /**
- * @defgroup databasei database
+ * @defgroup database_t database
  * @{ @ingroup database
  */
 
@@ -121,7 +121,7 @@ struct database_t {
 	 *
 	 * @note Either commit() or rollback() has to be called to end the
 	 * transaction.
-	 * @note Transactions are thread-specific. So commit()/rollbak() has to be
+	 * @note Transactions are thread-specific. So commit()/rollback() has to be
 	 * called from the same thread.
 	 * @note While this method can be called multiple times (commit/rollback
 	 * have to be called an equal number of times) real nested transactions are