Replace cmd with bash

Markdown parser doesn’t recognize cmd.

docs/tutorial/application-distribution.md

@@ -111,7 +111,7 @@ environment variable and have a clean rebuild:
 
 __Windows__
 
-```cmd
+```bash
 > set "GYP_DEFINES=project_name=myapp product_name=MyApp"
 > python script\clean.py
 > python script\bootstrap.py

docs/tutorial/quick-start.md

@@ -133,7 +133,7 @@ Electron binary to execute your app directly.
 
 On Windows:
 
-```cmd
+```bash
 $ .\electron\electron.exe your-app\
 ```