update: add example of 3D structure stream formatting

Author: JustinMeimar

gazprea/spec/globals.rst

@@ -25,7 +25,7 @@ If functions have access to mutable global state then we can not guarantee
 their purity.
 
 Globals must be initialized, but the initialization expressions may only contain
-a single _scalar_ literal. That means that functions and even previously defined globals may not
+a single scalar literal. That means that functions and even previously defined globals may not
 appear on the RHS of a global declaration. The reason is because it is very difficult to
 evaluate variables and functions at compile time. Global expression evaluation could
 be deferred to runtime, but that has the disadvantage of changing errors from compile

gazprea/spec/types/vector.rst

@@ -79,3 +79,19 @@ within the vector, and the second index selects the element within the array:
         vector<real[*]> ragged_right = [[1.0], [2.1]];
         length(ragged_right[1]) -> std_output; // prints 1
         ragged_right[2][1] -> std_output; // prints 2.1
+
+Stream Formatting
+~~~~~~~~~~~~~~~~~
+
+Printing a vector of two-dimensional arrays necessitates defining the formatting of a three-dimensional structure. The rules extend naturally from the 2D case.
+
+ ::
+
+        var vector<integer[2][2]> v;
+        v.push([[1,2], [3,4]]);
+        v.push([[5,6], [7,8]]);
+
+        // prints [[[5 6] [7 8]] [[1 2] [3 4]]]
+        reverse(v) -> std_output; 
+        
+