<nav> element should have aria-label

[DavidMacDonald]

http://www.w3.org/WAI/tutorials/page-structure/sections/

"It can be used multiple times on a page."
CODE SNIPPET:
`

…

`

consider this instead,
"It can be used multiple times on a page, but if used more than once, each should have a label to distinguish it from other navigation sections on the page."
CODE SNIPPET:
`

…

`