So far as I can tell, this is an issue with your connection parameters, as 
opposed to incorrect documentation.

If you can demonstrate that a modification of your $serverName parameter with the 
same essential information results in a successful connection, such that the 
documentation is incorrect, please do so.

I don't know how I can demonstrate it to you. But I just tested it again and I 
got the same error:
<?php
$serverName = "192.168.0.11";
$connectionInfo = array( "Database"=>"CorporeRM", "UID"=>"planilha", 
"PWD"=>"planilha");
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if( $conn ) {
     echo "Connection established.<br />";
}else{
     echo "Connection could not be established.<br />";
     die( print_r( sqlsrv_errors(), true));
}
?>

Result:
Connection established.

With the serverName:
<?php
$serverName = "192.168.0.11\SVDCBD01";
$connectionInfo = array( "Database"=>"CorporeRM", "UID"=>"planilha", 
"PWD"=>"planilha");
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if( $conn ) {
     echo "Connection established.<br />";
}else{
     echo "Connection could not be established.<br />";
     die( print_r( sqlsrv_errors(), true));
}
?>

Result:
Connection could not be established.
Array
(
    [0] => Array
        (
            [0] => 08001
            [SQLSTATE] => 08001
            [1] => -1
            [code] => -1
            [2] => [Microsoft][SQL Server Native Client 10.0]SQL Server Network 
Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF]. 
            [message] => [Microsoft][SQL Server Native Client 10.0]SQL Server 
Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF]. 
        )

    [1] => Array
        (
            [0] => HYT00
            [SQLSTATE] => HYT00
            [1] => 0
            [code] => 0
            [2] => [Microsoft][SQL Server Native Client 10.0]Login timeout 
expired
            [message] => [Microsoft][SQL Server Native Client 10.0]Login timeout 
expired
        )

    [2] => Array
        (
            [0] => 08001
            [SQLSTATE] => 08001
            [1] => -1
            [code] => -1
            [2] => [Microsoft][SQL Server Native Client 10.0]A network-related 
or instance-specific error has occurred while establishing a connection to SQL 
Server. Server is not found or not accessible. Check if instance name is correct 
and if SQL Server is configured to allow remote connections. For more 
information see SQL Server Books Online.
            [message] => [Microsoft][SQL Server Native Client 10.0]A network-
related or instance-specific error has occurred while establishing a connection 
to SQL Server. Server is not found or not accessible. Check if instance name is 
correct and if SQL Server is configured to allow remote connections. For more 
information see SQL Server Books Online.
        )


I also took a screenshot of the server configuration and hosted on ImagesHack:
http://img829.imageshack.us/img829/5719/doct.jpg