Bug 190346

The handbook advice to install devel/subversion in order to upgrade system/doc/port source :

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/svn.html

Unfortunately subversion has many dependencies:
Port:	subversion-1.8.8_2
Path:	/usr/ports/devel/subversion
Info:	Version control system
Maint:	lev@FreeBSD.org
B-deps:	apr-1.5.1.1.5.3 db48-4.8.30.0 expat-2.1.0 gdbm-1.11 gettext-0.18.3.1 libiconv-1.14_3 libtool-2.4.2_2 pkgconf-0.9.5 serf-1.3.5 sqlite3-3.8.4.2
R-deps:	apr-1.5.1.1.5.3 db48-4.8.30.0 expat-2.1.0 gdbm-1.11 gettext-0.18.3.1 libiconv-1.14_3 serf-1.3.5 sqlite3-3.8.4.2
WWW:	http://subversion.apache.org/

under 10.0, the base system has svnlite which can be use for this task.
Before 10, the port/package net/svnup can be used.

Port:	svnup-1.05
Path:	/usr/ports/net/svnup
Info:	Lightweight program to pull source from an Apache Subversion server
Maint:	jcm@visi.com
B-deps:
R-deps:
WWW:	http://jcm.dsl.visi.com/freebsd/svnup/

svnup (and probably svnlite) was created to remove the need to install subversion and all its dependencies. The handbook should be modified to teach users to use them instead of subversion.