improvement to procmailrc man page for procmail-3.22-7

I'm using procmail version 3.22 release 7, packaged for RedHat-8.0.

The procmailrc man page states

       Flags can be any of the following:

       H    Egrep the header (default).

       B    Egrep the body.

	...

       ?    Use the exitcode of the specified program.

In fact, H and B determine what gets checked in a condition,
so that * ? _command_ will see (only) what's specified.

Suggested updates to the man page are

       Flags can be any of the following:

       H    Check condition (usually with egrep) on the header (default).

       B    Check condition (usually with egrep) on the body.

	...

       ?    Use the exitcode of the specified program, using
	    the header (H) and/or body (B) as standard input.

Hope this helps.  /Jskud