docs: 📝 update code in documentation on how to start using rap

vignettes/initial-setup.qmd

@@ -43,7 +43,7 @@ properly. In your Console, type out the below code, replacing my name
 (Luke) and my email with your own:
 
 ```{r}
-ukbAid::setup_git_config("Luke W. Johnston", "[email protected]")
+ukbAid::proj_setup_git_config("Luke W. Johnston", "[email protected]")
 ```
 
 You should get an output showing your `user.email` and `user.name`.