doc: correct TODO, NOTE and FIX comment statements

src/render.zig

@@ -85,7 +85,7 @@ pub const Buffered = struct {
 
     /// Write *virtual screen* to alternate screen (should be called once and last during each render loop iteration in the main loop).
     pub fn flush(this: *@This()) !void {
-        // TODO: measure timings of rendered frames?
+        // TODO measure timings of rendered frames?
         const writer = terminal.writer();
         const s = this.screen;
         const vs = this.virtual_screen;