[doc]: Updated the CI section.

Documented when do we build the electron-based applications.

Author: kittaakos

electron/README.md

@@ -6,20 +6,22 @@ All-in-one packager producing the `Arduino Pro IDE` Electron-based application.
 
 The prerequisites are defined [here](https://github.com/theia-ide/theia/blob/master/doc/Developing.md#prerequisites).
 
-### Build:
+## Build
 To build the Arduino Pro IDE application you have to do the followings:
 ```bash
 yarn --cwd ./electron/packager/ && yarn --cwd ./electron/packager/ package
 ```
 
 The packaged application will be under the `./electron/build/dist` folder.
 
-### CI:
+## CI
+We always build an electron-based application for Windows. Create a PR, and the CI will automatically create the app for Windows. Do you need the builds for macOS and Linux? Start a build manually.
+
 The electron packager runs when:
  - the build is manually triggered by the user, or
  - on scheduled (CRON) jobs.
 
-### Creating a Release Draft:
+## Creating a Release Draft
 One can create a GitHub release draft, tag the source, and upload the artifacts to GitHub with Azure.
  - Go to the Azure [build](https://dev.azure.com/typefox/Arduino/_build) page.
  - Click on `Queue` in the top right corner.
@@ -32,7 +34,7 @@ One can create a GitHub release draft, tag the source, and upload the artifacts
  - 🎈🎉
 
 
-### Publishing the Release Draft:
+## Publishing the Release Draft
 One has to manually publish the GitHub release.
  - Go to the [release page](https://github.com/bcmi-labs/arduino-editor/releases) of the `arduino-editor` repository.
  - Select your release draft.