Remove repetitive and unnecessary table of applications from synopsis.
Remove mention of Adobe Reader, which has been deprecated.  Since Adobe
Reader was the last Linux-native application discussed, remove the
mention of Linux emulation from the synopsis.  Add ePDFview and Okular
to the document viewers section for PR 193668.

PR:		193668 (partial)
Submitted by:	raul.cheleguini@gmail.com, anthony@acperkins.com


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45706 c2e8774f-c49f-e111-b436-862b2bbc8956