Bug 120152

The file doc/en/books/developers-handbook/tools-intro.html claims:

   Compilers for C, C++, and Fortran and an assembler come with the
   basic system, not to mention a Perl interpreter and classic UNIX
   tools such as sed and awk.

Fix: 

I'd remove the reference to Perl in this sentence, rewriting:

   Compilers for C, C++, and Fortran and an assembler come with the
   basic system, not to mention classic UNIX tools such as sed and
   awk.

The next sentence in the file refers to additional tools being
available in the ports collection.  We could point people to the
next section (developers-handbook/tools-programming.html) maybe
with a hyperlink, so that impatient readers could quickly establish
that getting Perl was an easy thing:

   If that is not enough, there are many more compilers and
   interpreters in the Ports collection--See sections 2.3.2 and
   2.3.3 of this Handbook for more information.
How-To-Repeat: 
Read the relevant section (2.2 Introduction) of a recent developer's
handbook, first sentence.  My handbook was cvsup'd from the docs
on the 29th January 2008, in the afternoon US/Eastern time.