about_function doc error

The help about_function doc seems mixed up:

"...You can also define parameters in filters. For example, to create a
filter
that returns a list of processes with a certain initial letter, use
a format such as the following:

filter process_1
{
param([string]$first)
$_.processname -like "$first*"
}

When you call the filter, you must specify the first letter as an
argument, as shown in the following example:
Get-Process | where { process_1 c } ..."

This seems to have a few issues. 1) the filter returns bool, not an object
and 2) "where { filter }" is not correct.
I think the intention was this:

filter process_1
{
param([string]$first)
if ($_.processname -like "$first*") {$_}
}

PS c:\> process | process_1 win

--
William Stacey [C# MVP]