Fix an Asciidoc warning on quoted text

Fix a quoting block that was causing an Asciidoc warning. For the
reference, quote blocks use either no delimiter, or underscores in
case of multiple paragraphs separated with a blank line:
http://www.methods.co.nz/asciidoc/userguide.html#X51
Prevent smartphones to be too smart

Add HTML <meta> tag to not auto-create telephone number links on mobile browsers

Reference: https://github.com/networkupstools/nut/issues/78