Change modernizr script reference in How To Use

Neither download or repo include a file named Modernizr-yesnope.js but do include modernizr-custom.js.

If the intent of the How To is to suggest devs may use their own version of Modernizr then this should be more explicitly called out as in my second example.

In either case I'm not at all clear why Modernizr-yesnope.js is used, if I create my own production Modernizr from their build tool I don't get that file.
Fix typo in docs: falshpro -> flashpro
Merge pull request #197 from lojjic/patch-1

Fix typo in docs: falshpro -> flashpro
Merge pull request #196 from billsaysthis/patch-1

Change modernizr script reference in How To Use
Updating w3c html5 links to the new whatwg "living standard"
Merge pull request #202 from cori/w3c-url-updates

Updating w3c html5 links to the new whatwg "living standard"
fix typo
remove browser sniffing (fixes issue #198)
remove browser sniff (fixes Issue #198)
add $.event.customEvent for jQuery 1.9.0 and remove browser sniff (fixes #199, #198 and #201)
fix geolocation options (Issue #205)
fix jquery event dispatch ( Issue #203 )
version 1.9.6 RC1