pgsql: doc: Update tool sets documentation for modern FreeBSD

doc: Update tool sets documentation for modern FreeBSD

For several operating systems, we give handy package manager one-liners
to install all the requirements for building our documentation. All
current production FreeBSD releases have a friendly new package manager
a bit like apt/yum, so give a one line command here. Also, add a brief
note about gmake vs make in the doc subdirectory.

Author: Thomas Munro <thomas.munro@enterprisedb.com>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/9212810c4f4a596fc398644e96925a8a0f0332e8

Modified Files
--------------
doc/src/sgml/docguide.sgml | 13 +++++++++++++
1 file changed, 13 insertions(+)

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