nixos/manual: document you need root for container

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nixos
doc
manual
administration
+5 -1
nixos/doc/manual/administration/imperative-containers.xml
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<title>Imperative Container Management</title>
<para>We’ll cover imperative container management using
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<command>nixos-container</command> first. You create a container with
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<command>nixos-container</command> first.
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Be aware that container management is currently only possible
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as <literal>root</literal>.</para>
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<para>You create a container with
identifier <literal>foo</literal> as follows:
<screen>