Fix typos

lib/index.js

@@ -377,7 +377,7 @@ MarkdownIt.prototype.set = function (options) {
  * MarkdownIt.configure(presets)
  *
  * Batch load of all options and compenent settings. This is internal method,
- * and you probably will not need it. But if you with - see available presets
+ * and you probably will not need it. But if you will - see available presets
  * and data structure [here](https://github.com/markdown-it/markdown-it/tree/master/lib/presets)
  *
  * We strongly recommend to use presets instead of direct config loads. That
@@ -503,7 +503,7 @@ MarkdownIt.prototype.use = function (plugin /*, params, ... */) {
  * - src (String): source string
  * - env (Object): environment sandbox
  *
- * Parse input string and returns list of block tokens (special token type
+ * Parse input string and return list of block tokens (special token type
  * "inline" will contain list of inline tokens). You should not call this
  * method directly, until you write custom renderer (for example, to produce
  * AST).