Add better example to demonstrate multi-dir merging

README.md

@@ -155,22 +155,20 @@ explore /tmp/tmp.X6OQb5tJwr` to explore an existing sandbox.
 To specify multiple lower directories for overlay (by merging them together), you can use the `-L` flag followed by a colon-separated list of directories. The directories on the left have higher precedence and can overwrite the directories on the right:
 
 ```ShellSession
-$ try -D rustup-sandbox "curl https://sh.rustup.rs > rustup.sh"
+$ try -D sandbox1 "echo 'File 1 Contents - sandbox1' > file1.txt"
 ...
-$ try -L rustup-sandbox "sh rustup.sh"
-
-Changes detected in the following files:
-
-rustup-sandbox//upperdir/home/ubuntu/.profile (modified/added)
-rustup-sandbox//upperdir/home/ubuntu/.bashrc (modified/added)
-rustup-sandbox//upperdir/home/ubuntu/.rustup/update-hashes/stable-x86_64-unknown-linux-gnu (modified/added)
+$ try -D sandbox2 "echo 'File 2 Contents - sandbox2' > file2.txt"
+...
+$ try -D sandbox3 "echo 'File 2 Contents - sandbox3' > file2.txt"
 ...
 
-Commit these changes? [y/N] y
-
+# Now use the -L flag to merge both sandbox directories together, with sandbox3 having precedence over sandbox2
+$ try -L "sandbox3:sandbox2:sandbox1" "cat file1.txt file2.txt"
+File 1 Contents - sandbox1
+File 2 Contents - sandbox3
 ```
 
-In this example, `try`` will merge `/lowerdir1`, `/lowerdir2` and `/lowerdir3` together before mounting the overlay. This way, you can combine the contents of multiple `try` sandboxes .
+In this example, `try` will merge `/sandbox1`, `/sandbox2` and `/sandbox3` together before mounting the overlay. This way, you can combine the contents of multiple `try` sandboxes.
 
 
 ## Known Issues