doc/toolbox: Clarify that Toolbx isn't a security mechanism

Using the word 'containerized' gives the false impression of heightened
security.  As if it's a mechanism to run untrusted software in a
sandboxed environment without access to the user's private data (such as
$HOME), hardware peripherals (such as cameras and microphones), etc..
That's not what Toolbx is for.

Toolbx aims to offer an interactive command line environment for
development and troubleshooting the host operating system, without
having to install software on the host.  That's all.  It makes no
promise about security beyond what's already available in the usual
command line environment on the host that everybody is familiar with.

containers#1020

doc/toolbox.1.md

@@ -13,9 +13,15 @@ toolbox - Tool for interactive command line environments on Linux
 
 ## DESCRIPTION
 
-Toolbx is a tool for Linux operating systems, which allows the use of
-containerized command line environments. It is built on top of Podman and
-other standard container technologies from OCI.
+Toolbx is a tool for Linux, which allows the use of interactive command line
+environments for software development and troubleshooting the host operating
+system, without having to install software on the host. It is built on top of
+Podman and other standard container technologies from OCI.
+
+Toolbx environments have seamless access to the user’s home directory, the
+Wayland and X11 sockets, networking (including Avahi), removable devices (like
+USB sticks), systemd journal, SSH agent, D-Bus, ulimits, /dev and the udev
+database, etc..
 
 This is particularly useful on OSTree based operating systems like Fedora
 CoreOS and Silverblue. The intention of these systems is to discourage
@@ -35,10 +41,11 @@ incrementally adopt containerization.
 
 The Toolbx environment is based on an OCI image. On Fedora this is the
 `fedora-toolbox` image. This image is used to create a Toolbx container that
-seamlessly integrates with the rest of the operating system by providing
-access to the user's home directory, the Wayland and X11 sockets, networking
-(including Avahi), removable devices (like USB sticks), systemd journal, SSH
-agent, D-Bus, ulimits, /dev and the udev database, etc..
+offers the interactive command line environment.
+
+Note that Toolbx makes no promise about security beyond what’s already
+available in the usual command line environment on the host that everybody is
+familiar with.
 
 ## Supported operating system distributions