docs: add description of where to pull repository when updating workspace (#419)

* docs: add description of  where to pull repository when updating workspace

Signed-off-by: Tier4Guan <muhua.guan@tier4.jp>

* style(pre-commit): autofix

---------

Signed-off-by: Tier4Guan <muhua.guan@tier4.jp>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Tier4Guan

docs/installation/autoware/source-installation.md

@@ -101,9 +101,11 @@ sudo apt-get -y install git
 
    ```bash
    cd autoware
-   git pull
+   git pull <remote> <your branch>
    ```
 
+   `<remote>` is usually `git@github.com:autowarefoundation/autoware.git`
+
 2. Update the repositories.
 
    ```bash