doc: various small doc fixes

Change-Id: I257f1e2f24edb75f6e7dee27b466c25d5da4521f
diff --git a/doc/tutorial/kubernetes/README.md b/doc/tutorial/kubernetes/README.md
index 3cfd06f..8eee896 100644
--- a/doc/tutorial/kubernetes/README.md
+++ b/doc/tutorial/kubernetes/README.md
@@ -597,7 +597,7 @@
 In this section we will look into generalizing the objects per directory.
 
 
-#### Directory `frontent`
+#### Directory `frontend`
 
 We observe that all deployments in subdirectories of `frontend`
 have a single container with one port,
@@ -1106,11 +1106,11 @@
 For ports we define two simple maps from name to port number:
 
 ```
-	// expose port defines named ports that is exposed in the service
-	expose port <N>: int
+    // expose port defines named ports that is exposed in the service
+    expose port <N>: int
 
-	// port defines a named port that is not exposed in the service.
-	port <N>: int
+    // port defines a named port that is not exposed in the service.
+    port <N>: int
 ```
 Both maps get defined in the container definition, but only `port` gets
 included in the service definition.
@@ -1161,14 +1161,14 @@
 // define services implied by deployments
 service "\(k)": {
 
-	// Copy over all ports exposed from containers.
-	port "\(Name)": {
-		port:       Port | int
-		targetPort: Port | int
-	} for Name, Port in spec.expose.port
+    // Copy over all ports exposed from containers.
+    port "\(Name)": {
+        port:       Port | int
+        targetPort: Port | int
+    } for Name, Port in spec.expose.port
 
-	// Copy over the labels
-	label: spec.label
+    // Copy over the labels
+    label: spec.label
 
 } for k, spec in deployment
 ```
@@ -1212,8 +1212,8 @@
 to write configurations.
 For instance, none of the files in the subdirectories contain comprehensions,
 not even the template files in these directores (such as `kitchen/kube.cue`).
-
-
+Furthermore, none of the configuration files in any of the
+leaf directories contain string interpolations.
 
 
 ### Metrics