build/pkgs/polymake/SPKG.rst: 'script package' -> 'dummy package', cosmetic edits

Author: Matthias Koeppe

build/pkgs/polymake/SPKG.rst

@@ -25,47 +25,48 @@ Dependencies
 ------------
 
 Polymake needs a working installation of Perl, including its shared
-library and some modules (XML::Writer XML::LibXML XML::LibXSLT
-Term::ReadLine::Gnu JSON SVG). The Polymake interface in Sage
-additionally needs File::Slurp. For full functionality including
-polymake's polyDB, also the Perl module MongoDB is needed.
+library and some modules (``XML::Writer XML::LibXML XML::LibXSLT
+Term::ReadLine::Gnu JSON SVG``). The Polymake interface in Sage
+additionally needs ``File::Slurp``. For full functionality including
+polymake's polyDB, also the Perl module ``MongoDB`` is needed.
 
-These are not provided by a Sage package. The script package
-perl_cpan_polymake_prereq will signal an error at build time if the
+These are not provided by a Sage package. The dummy package
+``perl_cpan_polymake_prereq`` will signal an error at build time if the
 required prerequisites are not met.
 
-The configure script will inform you about the equivalent system
+The ``configure`` script will inform you about the equivalent system
 packages that you should install. Otherwise, you can use CPAN (see
 below).
 
-Sage might install the Term::ReadLine::Gnu module, however, when you
+Sage might install the ``Term::ReadLine::Gnu`` module, however, when you
 install polymake, if it is not provided by the system, or if Sage
-installs its own readline library.
+installs its own ``readline`` library.
 
 
 A distribution-independent way to install Perl modules (into a user's
-home directory or /usr/local) is using CPAN. This is also the way to
+home directory or ``/usr/local``) is using CPAN. This is also the way to
 install the modules on macOS. For this, if you don't have root access,
-you will need the local::lib Perl module installed::
+you will need the ``local::lib`` Perl module installed::
 
    cpan -i XML::Writer XML::LibXML XML::LibXSLT File::Slurp Term::ReadLine::Gnu JSON SVG MongoDB
 
-Several Sage packages should be installed before installing the polymake
+Several Sage packages should be installed before installing the ``polymake``
 package to give a more featureful Polymake installation::
 
    sage -i 4ti2 latte_int topcom qhull
 
 Software that would need to be installed manually (no Sage package
-available) for a more featureful Polymake installation: azove, porta,
-vinci, SplitsTree4.
+available) for a more featureful Polymake installation: ``azove``, ``porta``,
+``vinci``, ``SplitsTree4``.
 
 Information on missing Polymake prerequisites after installing polymake::
 
    $ sage -sh
    (sage-sh) $ polymake
    polytope> show_unconfigured;
 
-In order to Polymake from Sage, you will need the JuPyMake::
+In order to use Polymake from Sage, you will also need the ``jupymake``
+package::
 
   sage -i jupymake