Update ctr-example to 0.13.0 and clean readme

Signed-off-by: Kathryn Baldauf <[email protected]>

Author: katiewasnothere

examples/ctr-example/Package.resolved

@@ -17,7 +17,7 @@
 
 import PackageDescription
 
-let scVersion = "0.12.0"
+let scVersion = "0.13.0"
 
 let package = Package(
     name: "ctr-example",

examples/ctr-example/Package.swift

@@ -2,7 +2,6 @@
 
 Very basic example of launching a Linux container using Containerization.
 
----
 ## Build and Run
 
 ### 1. Fetch Kernel
@@ -17,16 +16,17 @@ You should now see the `vmlinux` image in examples/ctr-example
 From examples/ctr-example run
 `make all`
 
-> [!NOTE]
+> [!WARNING]
 > If you get the following error, try building from the default MacOS terminal:
 > `error: compiled module was created by a newer version of the compiler`
 
-After the build completes, the example will run. In your terminal you should see
-`Starting container example...`
-`Creating container from docker.io/library/alpine:3.16...`
-`Starting container...`
-`/ #`
+After the build completes, the example will run. In your terminal you should see something like:
 
-**Congratulations, you've started the example container!**
+```
+Starting container example...
+Creating container from docker.io/library/alpine:3.16...
+Starting container...
+/ #
+```
 
----
+**Congratulations, you've started the example container!**