Expand the documentation of "no-new-privileges"
Expand the documentation of "no-new-privileges"

The change to runc in https://github.com/opencontainers/runc/pull/789
was not documented previously. Also say what this affects and clean
up layout of initial table as there was some miscolouration of the
continuation lines.

Signed-off-by: Justin Cormack <af64ee19f04db9509cb02b0e470e11e5402ef9b3@docker.com>
(cherry picked from commit 3050d9af9b2384baed599be9d7142b4775f89e10)
Signed-off-by: Tibor Vass <3f1326dff4d85ad4ec938fb33f64575ace96db26@docker.com>

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