Fix an instance of doubled words in the docs

Delete unnecessary "use PDO" statement

DBAL-522 - SQLParserUtils always throws exceptions on null bound params

Demonstrates that NULL parameters are handled incorrectly by the sql parser utils as of 2.3.4

Fixed generated sql for postgres substring function

Remove unnecessary code from Connection::insert

Shard description requires an 'id' not 'name'

Update lib/Doctrine/DBAL/Types/BlobType.php

Postgres fix for a possible unavailable dbname

Added query micro-optimization

Fixed a PHP warning in DBALException::driverExceptionDuringQuery()

added index flags to schema table

fixed bug on schema comparator, prevent multiple rename candidates for a single original field