Fix wrong example of how to add argument to rawGit

[cncsl]

PR Description

The original setup example caused a error exit, so I fix it.

2026/08/14 10:26:23 The config at `/Users/cncsl/.config/lazygit/config.yml` couldn't be parsed, please inspect it before opening up an issue.
yaml: unmarshal errors:
  line 7: cannot unmarshal !!str `--color...` into []string

Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here): No code changes
• Tests have been added/updated (see here for the integration test guide): No need to
• Text is internationalised (see here): Only one document was modified.
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here): Only one document was modified.
• Docs have been updated if necessary: YES
• You've read through your own file changes for silly mistakes etc: YES

[stefanhaller]

Thank you; fixed (a little bit differently) in #5927.