FreeBSD/doc f5c5a0e (r52765)en_US.ISO8859-1/books/handbook/x11 chapter.xml

Remove instructions about outdated KDE4 and replace
them with KDE5 Plasma.

The instructions are rewritten to cover KDE5 specifics
like installing the necessary packages (SDDM).

Happy KDE5-ing on FreeBSD!

PR:                     231235
Submitted by:           lbartoletti at tuxfamily.org
Reviewed by:            kde@, tcberner@
Approved by:            tcberner@
Differential Revision:  https://reviews.freebsd.org/D18813
DeltaFile
+13-9en_US.ISO8859-1/books/handbook/x11/chapter.xml
+13-91 files

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