Remove EXAMPLES section.

Remove EXAMPLES section.
The example itself was taken directly from the POSIX specification by jmc@,
who doesn't remember adding it. This example isn't very clear about what
it actually does, so just remove it.

If someone can come up with one or more examples that give a more clear
introduction to the workings of sed feel free to send them in.

Prompted by a diff by kshe59 <at> zoho <dot> eu
OK jmc@