docs: add missing escape char (#280)

README.md

@@ -72,7 +72,7 @@ And run `webpack` via your preferred method.
 |    **[`publicPath`](#publicpath)**    |     `{String\|Function}`     |  based on `output.publicPath`   | specifies the public URL address of the output files when referenced in a browser |
 |      **[`filename`](#filename)**      |     `{String\|Function}`     |   based on `output.filename`    | The filename of entry chunks for web workers                                      |
 | **[`chunkFilename`](#chunkfilename)** |          `{String}`          | based on `output.chunkFilename` | The filename of non-entry chunks for web workers                                  |
-|        **[`inline`](#inline)**        | `'no-fallback' | 'fallback'` |           `undefined`           | Allow to inline the worker as a `BLOB`                                            |
+|        **[`inline`](#inline)**        | `'no-fallback'\|'fallback'`  |           `undefined`           | Allow to inline the worker as a `BLOB`                                            |
 |      **[`esModule`](#esmodule)**      |         `{Boolean}`          |             `true`              | Use ES modules syntax                                                             |
 
 ### `worker`