examples: add some TODOs

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

examples/custom-renderer/Renderer.zig

@@ -1,4 +1,5 @@
 // TODO(important): docs
+// TODO(important): review all code in this file in-depth
 const std = @import("std");
 
 const mach = @import("mach");

examples/glyphs/Game.zig

@@ -1,3 +1,4 @@
+// TODO(important): review all code in this file in-depth
 const std = @import("std");
 const mach = @import("mach");
 const core = mach.core;

examples/glyphs/Text.zig

@@ -1,3 +1,4 @@
+// TODO(important): review all code in this file in-depth
 const mach = @import("mach");
 const gpu = mach.gpu;
 const ecs = mach.ecs;

examples/glyphs/main.zig

@@ -1,3 +1,5 @@
+// TODO(important): review all code in this file in-depth
+
 // Experimental ECS app example. Not yet ready for actual use.
 const mach = @import("mach");
 

examples/sprite/Game.zig

@@ -1,3 +1,4 @@
+// TODO(important): review all code in this file in-depth
 const std = @import("std");
 const zigimg = @import("zigimg");
 const assets = @import("assets");

examples/sprite/main.zig

@@ -1,3 +1,5 @@
+// TODO(important): review all code in this file in-depth
+
 // Experimental ECS app example. Not yet ready for actual use.
 const mach = @import("mach");
 

examples/text/Game.zig

@@ -1,3 +1,4 @@
+// TODO(important): review all code in this file in-depth
 const std = @import("std");
 const zigimg = @import("zigimg");
 const assets = @import("assets");

examples/text/main.zig

@@ -1,3 +1,5 @@
+// TODO(important): review all code in this file in-depth
+
 // Experimental ECS app example. Not yet ready for actual use.
 const mach = @import("mach");