fix formatting in upgrading chromium doc

docs/development/upgrading-chromium.md

@@ -12,10 +12,11 @@ This is an overview of the steps needed to upgrade Chromium in Electron.
 ## Upgrade `libcc` to a new Chromium version
 
 1. Get the code and initialize the project:
-  - ```sh
+  ```sh
   $ git clone git@github.com:electron/libchromiumcontent.git
   $ cd libchromiumcontent
-  $ ./script/bootstrap -v```
+  $ ./script/bootstrap -v
+  ```
 2. Update the Chromium snapshot
   - Choose a version number from [OmahaProxy](https://omahaproxy.appspot.com/)
     and update the `VERSION` file with it
@@ -47,18 +48,18 @@ This is an overview of the steps needed to upgrade Chromium in Electron.
 ## Update Electron's code
 
 1. Get the code:
-  - ```sh
-    $ git clone git@github.com:electron/electron.git
-    $ cd electron
-    ```
+  ```sh
+  $ git clone git@github.com:electron/electron.git
+  $ cd electron
+  ```
 2. If you have libcc built on your machine in its own repo,
    tell Electron to use it:
-  - ```sh
-    $ ./script/bootstrap.py -v \
-  	--libcc_source_path <libcc_folder>/src \
-  	--libcc_shared_library_path <libcc_folder>/shared_library \
-  	--libcc_static_library_path <libcc_folder>/static_library
-     ```
+  ```sh
+  $ ./script/bootstrap.py -v \
+    --libcc_source_path <libcc_folder>/src \
+    --libcc_shared_library_path <libcc_folder>/shared_library \
+    --libcc_static_library_path <libcc_folder>/static_library
+  ```
 3. If you haven't yet built libcc but it's already supposed to be upgraded
    to a new Chromium, bootstrap Electron as usual
    `$ ./script/bootstrap.py -v`