Itemize text in docs/securing_installation.md (#5217)
Itemize text in docs/securing_installation.md (#5217)

Signed-off-by: Takao Shibata <d6813c22be1578634a466f8a52d3914b87fdfd4e@gmail.com>
SlickNik/helm,appscode/helm,appscode/helm,jascott1/helm,jascott1/helm,SlickNik/helm