Update location of tutorial files in Porch repo (#174)

When the tutorial documentation was moved to the "docs" repo, we did not
move the example config into the examples directory in the Porch repo.
This PR updates the tutorial to refer to the location of the tutorial
files.

See also the porch update in this PR:
nephio-project/porch#117

content/en/docs/porch/using-porch/install-and-using-porch.md

@@ -33,7 +33,7 @@ The following software should be installed prior to running through the tutorial
 ```bash
 git clone https://github.com/nephio-project/porch.git
 
-cd porch/docs/tutorials/starting-with-porch/
+cd porch/examples/tutorials/starting-with-porch/
 ```
 
 ## Create the Kind clusters for management and edge1