Clarify DSN for SQLite on Windows (#1490547)

INSTALL

@@ -83,6 +83,7 @@ DATABASE SETUP
 ==============
 
 Note: Database for Roundcube must use UTF-8 character set.
+Note: See defaults.inc.php file for examples of DSN configuration.
 
 * MySQL
 -------

config/config.inc.php.sample

@@ -21,9 +21,10 @@ $config = array();
 
 // Database connection string (DSN) for read+write operations
 // Format (compatible with PEAR MDB2): db_provider://user:password@host/database
-// Currently supported db_providers: mysql, pgsql, sqlite, mssql or sqlsrv
+// Currently supported db_providers: mysql, pgsql, sqlite, mssql, sqlsrv, oracle
 // For examples see http://pear.php.net/manual/en/package.database.mdb2.intro-dsn.php
-// NOTE: for SQLite use absolute path: 'sqlite:////full/path/to/sqlite.db?mode=0646'
+// NOTE: for SQLite use absolute path (Linux): 'sqlite:////full/path/to/sqlite.db?mode=0646'
+//       or (Windows): 'sqlite:///C:/full/path/to/sqlite.db'
 $config['db_dsnw'] = 'mysql://roundcube:pass@localhost/roundcubemail';
 
 // The mail host chosen to perform the log-in.

config/defaults.inc.php

@@ -21,9 +21,10 @@ $config = array();
 
 // Database connection string (DSN) for read+write operations
 // Format (compatible with PEAR MDB2): db_provider://user:password@host/database
-// Currently supported db_providers: mysql, pgsql, sqlite, mssql or sqlsrv
+// Currently supported db_providers: mysql, pgsql, sqlite, mssql, sqlsrv, oracle
 // For examples see http://pear.php.net/manual/en/package.database.mdb2.intro-dsn.php
-// NOTE: for SQLite use absolute path: 'sqlite:////full/path/to/sqlite.db?mode=0646'
+// NOTE: for SQLite use absolute path (Linux): 'sqlite:////full/path/to/sqlite.db?mode=0646'
+//       or (Windows): 'sqlite:///C:/full/path/to/sqlite.db'
 $config['db_dsnw'] = 'mysql://roundcube:@localhost/roundcubemail';
 
 // Database DSN for read-only operations (if empty write database will be used)