docs(typeahead): fix select-on-blur typo

Closes #4008

src/typeahead/docs/readme.md

@@ -56,6 +56,6 @@ The typeahead directives provide several attributes:
    _(Defaults: true)_ :
    Should the first match automatically be focused as you type?
 
-* `select-on`blur`
+* `typeahead-select-on-blur`
    _(Defaults: false)_ :
    On blur, select the currently highlighted match