docs(input[number]): fix typo

Author: gkalpak

src/ng/directive/input.js

@@ -688,7 +688,7 @@ var inputType = {
    *    but does not trigger HTML5 native validation. Takes an expression.
    * @param {string=} step Sets the `step` validation error key if the value entered does not fit the `step` constraint.
    *    Can be interpolated.
-   * @param {string=} ngStep Like `step`, sets the `max` validation error key if the value entered does not fit the `ngStep` constraint,
+   * @param {string=} ngStep Like `step`, sets the `step` validation error key if the value entered does not fit the `ngStep` constraint,
    *    but does not trigger HTML5 native validation. Takes an expression.
    * @param {string=} required Sets `required` validation error key if the value is not entered.
    * @param {string=} ngRequired Adds `required` attribute and `required` validation constraint to