doc: improve description of configuration and access control

Thanks: dolf_ via IRC

doc/installation/configuration.rst

@@ -25,25 +25,30 @@ Access
 ------
 
 The munin node listens on all interfaces by default, but has a
-restrictive access list. You need to add your master's IP address.
+restrictive access list. You need to add your master's IP address
+to ``/etc/munin/munin-node.conf``.
 
-The "cidr_allow", "cidr_deny", "allow" and "deny" statements are used.
+The ``cidr_allow``, ``cidr_deny``, ``allow`` and ``deny`` directives
+are related to access control.
 
-cidr_allow uses the following syntax (the /32 is not implicit, so for
+``cidr_allow`` expects the following notation:
+syntax (the /32 is not implicit, so for
 a single host, you need to add it):
 
     | cidr_allow 127.0.0.0/8
     | cidr_allow 192.0.2.1/32
 
-allow uses regular expression matching against the client IP address.
+Please note, that the prefix length (e.g. ``/32``) is mandatory for
+``cidr_allow`` and ``cidr_deny``.
+
+``allow`` uses regular expression matching against the client IP address.
 
     | allow '^127\.'
     | allow '^192\.0\.2\.1$'
 
 For specific information about the syntax, see `Net::Server
 <http://search.cpan.org/dist/Net-Server/lib/Net/Server.pod>`_. Please
-keep in mind that cidr_allow is a recent addition, and may not be
-available on all systems.
+keep in mind that ``cidr_allow`` requires the ``Net::CIDR`` perl module.
 
 Startup
 -------

doc/installation/webserver.rst

@@ -12,6 +12,9 @@ On the master, you need to configure a web server.
 
 If you have installed "munin" through distribution
 packages, a webserver may have been configured for you already.
+Details of such packaged setups depend on your distribution.
+For example in Debian (or derivatives) you may want to take a look
+at ``/usr/share/doc/munin/README.Debian``.
 
 If you installed from source, you may want to take a look at the following examples:
 

doc/reference/munin-httpd.rst

@@ -6,6 +6,8 @@
  munin-httpd
 =============
 
+.. note:: munin-httpd was introduced in the munin 3.0 release series.
+
 DESCRIPTION
 ===========