Fix typos

Author: VojtechVitek

jwtauth.go

@@ -253,7 +253,7 @@ func SetExpiryIn(claims map[string]interface{}, tm time.Duration) {
 	claims["exp"] = ExpireIn(tm)
 }
 
-// TokenFromCookie tries to retreive the token string from a cookie named
+// TokenFromCookie tries to retrieve the token string from a cookie named
 // "jwt".
 func TokenFromCookie(r *http.Request) string {
 	cookie, err := r.Cookie("jwt")
@@ -263,8 +263,8 @@ func TokenFromCookie(r *http.Request) string {
 	return cookie.Value
 }
 
-// TokenFromHeader tries to retreive the token string from the
-// "Authorization" reqeust header: "Authorization: BEARER T".
+// TokenFromHeader tries to retrieve the token string from the
+// "Authorization" request header: "Authorization: BEARER T".
 func TokenFromHeader(r *http.Request) string {
 	// Get token from authorization header.
 	bearer := r.Header.Get("Authorization")
@@ -274,7 +274,7 @@ func TokenFromHeader(r *http.Request) string {
 	return ""
 }
 
-// TokenFromQuery tries to retreive the token string from the "jwt" URI
+// TokenFromQuery tries to retrieve the token string from the "jwt" URI
 // query parameter.
 //
 // To use it, build our own middleware handler, such as: