improve wording of 052

exercises/052_slices.zig

@@ -17,11 +17,12 @@
 //
 //     const foo = digits[0..1];  // 0
 //     const bar = digits[3..9];  // 3 4 5 6 7 8
+//     const bar = digits[5..9];  // 5 6 7 8
 //     const all = digits[0..];   // 0 1 2 3 4 5 6 7 8 9
 //
-// As you can see, a slice [x..y] defines a first item by index x and
+// As you can see, a slice [x..y] starts with the index of the
-// a length y (where y-1 is the index of the last item). Leaving y off
+// first item at x and the last item at y-1. You can leave the y
-// gives you the rest of the items.
+// off to get "the rest of the items".
 //
 // Notice that the type of a slice on an array of u8 items is []u8.
 //
@@ -47,3 +48,6 @@ fn printHand(hand: ???) void {
         std.debug.print("{u} ", .{h});
     }
 }
+//
+// Fun fact: Under the hood, slices are stored as a pointer to
+// the first item and a length.