Add OCC_UPDATE_URL to the README.

Signed-off-by: Camila Ayres <[email protected]>

Author: camilasan

README.md

@@ -69,7 +69,7 @@ If the default `config.php` doesn't hold update information for this OEM, the co
 
 1. Create the json file in `config/` with the name of the OEM that contains the same entries as the `config.php`, e.g. `nextcloudev.json`.
 2. To test this update server locally use `composer start`, which then will run the server on localhost port 1234.
-3. Alternativately, you can directly execute: `php -S 0.0.0.0:1234 -t .`
+3. Alternativately, you can directly execute: `php -S 0.0.0.0:1234 -t .`.
 4. To generate debug logs while developing:
     - Create a `php.ini` in the root folder with the following content:
       ```
@@ -80,14 +80,14 @@ If the default `config.php` doesn't hold update information for this OEM, the co
 
 ### Desktop client
 
-- For all platforms: 
-   - Enable `BUILD_UPDATER`
-   - Set `APPLICATION_UPDATE_URL` with `http://0.0.0.0:1234`.
+- For all platforms, with cmake: 
+   - Enable `BUILD_UPDATER`.
+   - Set `APPLICATION_UPDATE_URL` with `http://0.0.0.0:1234` or the following environment variable when running the client: `export OCC_UPDATE_URL="http://0.0.0.0:1234"`.
 - On mac OS: 
-   - Build the app bundle with the updater enabled and codesigned using [mac-crafter](https://github.com/nextcloud/desktop/tree/master/admin/osx/mac-crafter).
+   - Build the app bundle and codesign it using [mac-crafter](https://github.com/nextcloud/desktop/tree/master/admin/osx/mac-crafter).
    - Alternativately, with cmake:
-     - Enable `BUILD_OWNCLOUD_OSX_BUNDLE` 
-     - Set `SPARKLE_LIBRARY`
+     - Enable `BUILD_OWNCLOUD_OSX_BUNDLE`.
+     - Set `SPARKLE_LIBRARY`.
      - `codesign` the `Sparkle.framework` and the app bundle.
 
 ## Deployment