fix typo for paramsInt function (#1913)

ctx.go

@@ -858,7 +858,7 @@ func (c *Ctx) AllParams() map[string]string {
 // it defaults to zero if the parameter is not found or if the
 // parameter cannot be converted to an integer
 // If a default value is given, it will return that value in case the param
-// doesn't exist or cannot be converted to an integrer
+// doesn't exist or cannot be converted to an integer
 func (c *Ctx) ParamsInt(key string, defaultValue ...int) (int, error) {
 	// Use Atoi to convert the param to an int or return zero and an error
 	value, err := strconv.Atoi(c.Params(key))