docs: fix minor typos (#10565)

doc/docs.md

@@ -2043,11 +2043,11 @@ fn (foo &Foo) bar() {
 In general, V's references are similar to Go pointers and C++ references.
 For example, a generic tree structure definition would look like this:
 
-```v wip
+```v
 struct Node<T> {
-    val   T
-    left  &Node
-    right &Node
+	val   T
+	left  &Node<T>
+	right &Node<T>
 }
 ```