The examples section of this manual page is rather hard to grok.
First, the arrangement of the text as follows makes life harder
than needed for the reader:
shell demo
explanatory text
It helps the reader if an example *begins* with an explanation of
what is being demonstrated. Therefore, rearrange these examples as:
explanatory text
shell demo
In addition, let's provide a bit more explanation for the first three
examples and expand the second example (user namespaces) a little.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>