doc: a few small fixes

Change-Id: Ia0c73d82feb6c736fbaf031c8ed95a43e923fe59
Reviewed-on: https://cue-review.googlesource.com/c/1540
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/doc/ref/spec.md b/doc/ref/spec.md
index 6292616..71efed3 100644
--- a/doc/ref/spec.md
+++ b/doc/ref/spec.md
@@ -436,7 +436,7 @@
 ```
 
 Carriage return characters (`\r`) inside string literals are discarded from
-the raw string value.
+the string value.
 
 ```
 'a\000\xab'
diff --git a/doc/tutorial/basics/defaults.md b/doc/tutorial/basics/defaults.md
index 6af3c67..a7e59ca 100644
--- a/doc/tutorial/basics/defaults.md
+++ b/doc/tutorial/basics/defaults.md
@@ -27,5 +27,5 @@
 <!-- result -->
 ```
 replicas: 1
-protocol: _|_
+protocol: *"tcp" | *"udp"
 ```
\ No newline at end of file
diff --git a/doc/tutorial/basics/selectors.md b/doc/tutorial/basics/selectors.md
index 1b1d895..f48c4cf 100644
--- a/doc/tutorial/basics/selectors.md
+++ b/doc/tutorial/basics/selectors.md
@@ -22,7 +22,7 @@
 <!-- result -->
 ```
 a: {
-    b: 2
+    b:     2
     "c-e": 5
 }
 v: 2