strategy.js: fixed typo in comment

Merge pull request #152 from VivienAdnot/patch-1

lib/strategy.js

@@ -16,7 +16,7 @@ var passport = require('passport-strategy')
  *                               (asymmetric) for the given undecoded jwt token string and  request
  *                               combination. done has the signature function done(err, secret).
  *                               REQUIRED unless `secretOrKey` is provided.
- *          jwtFromRequest: (REQUIRED) Function that accepts a reqeust as the only parameter and returns the either JWT as a string or null
+ *          jwtFromRequest: (REQUIRED) Function that accepts a request as the only parameter and returns the either JWT as a string or null
  *          issuer: If defined issuer will be verified against this value
  *          audience: If defined audience will be verified against this value
  *          algorithms: List of strings with the names of the allowed algorithms. For instance, ["HS256", "HS384"].