Merge pull request plotly#2930 from plotly/LiamConnors-patch-1

fix typo

MAKE_A_NEW_BACK_END.md

@@ -32,7 +32,7 @@ Each back end must have a way to generate its own wrappers for these React compo
 There is a relatively small set of routes (urls/url patterns) that a Dash server must be prepared to serve. A good way to get a feel for them is to load https://dash.plotly.com/ and look at the page structure (“Elements” tab in Chrome devtools) and the network requests that are made on page load and their responses (“Network” tab). You can see all of the route patterns if you look at the main [`dash.dash` file](https://github.com/plotly/dash/blob/dev/dash/dash.py) and search for `self._add_url` - plus the one `self.server.register_blueprint` call above it. These routes are:
 - `""` and anything not caught by other routes listed below (see https://dash.plotly.com/urls): the “index” route, serving the HTML page skeleton. The Python back end implements a bunch of customization options for this, but for a first version these are unnecessary. See the template given in [`_default_index`](https://github.com/plotly/dash/blob/357f22167d40ef00c92ff165aa6df23c622799f6/dash/dash.py#L58-L74) for the basic structure and pieces that need to be included, most importantly `{%config}` that includes info like whether to display in-browser devtools, and `{%scripts}` and `{%renderer}` that load the necessary `<script>` tags and initialize the dash renderer.
 - `_dash-component-suites/<package_name>/<path>`: serve the JavaScript and related files given by each component package, as described above. Note that we include an extra cache-busting portion in each filename. In the Python version this is the version number and unix timestamp of the file as reported by the filesystem
-- `_dash-layout"`: Gives the JSON structure of the initial Dash components to render on the page (`app.layout` in Python)
+- `_dash-layout`: Gives the JSON structure of the initial Dash components to render on the page (`app.layout` in Python)
 - `_dash-dependencies`: A JSON array of all callback functions defined in the app.
 - `_dash-update-component`: Handles all server-side callbacks. Responds in JSON. Note that `children` outputs can contain Dash components, which must be JSON encoded the same way as in `_dash-layout`.
 - `_reload-hash`: once hot reloading is implemented and enabled (normally only during development), this route tells the page when something has changed on the server and the page should refresh.