Put sandboxes under /tmp in the -L option example

README.md

@@ -162,15 +162,12 @@ 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 sandbox1 "echo 'File 1 Contents - sandbox1' > file1.txt"
-...
-$ try -D sandbox2 "echo 'File 2 Contents - sandbox2' > file2.txt"
-...
-$ try -D sandbox3 "echo 'File 2 Contents - sandbox3' > file2.txt"
-...
+$ try -D /tmp/sandbox1 "echo 'File 1 Contents - sandbox1' > file1.txt"
+$ try -D /tmp/sandbox2 "echo 'File 2 Contents - sandbox2' > file2.txt"
+$ try -D /tmp/sandbox3 "echo 'File 2 Contents - sandbox3' > file2.txt"
 
 # 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"
+$ try -L "/tmp/sandbox3:/tmp/sandbox2:/tmp/sandbox1" "cat file1.txt file2.txt"
 File 1 Contents - sandbox1
 File 2 Contents - sandbox3
 ```