docs: bud get creates a directory named devos by default

As mentioned in #370 it would not result in a directory called `bud`, as
can be seen in the custom `get.bash` command where the directory name
defaults to `devos`.

doc/start/index.md

@@ -9,7 +9,7 @@ nix-shell -p cachix --run "cachix use nrdxp"
 nix-shell https://github.com/divnix/devos/archive/master.tar.gz -A shell \
   --run "bud get master"
 
-cd bud
+cd devos
 
 nix-shell
 
@@ -18,7 +18,7 @@ git add .
 git commit -m init
 ```
 
-This will place you in a new folder named `bud` with git initialized, and a
+This will place you in a new folder named `devos` with git initialized, and a
 nix-shell that provides all the dependencies, including the unstable nix
 version required.