letsplay_runner_core: Make it a bit more clear games run in their own…

… OS thread

Techinically it's an implementation detail, but it's pretty obvious based on logging, since the user can see other thread names (including the one used for the game). Might as well spell it out.

crates/letsplay_runner_core/src/client/game.rs

@@ -4,7 +4,10 @@ use super::GraphicsContexts;
 use std::time::Instant;
 
 /// A game that should be run by the runner core.
-/// A runner implementation implements this trait.
+/// 
+/// # Implementation notes
+/// `letsplay_runner_core` spawns off another OS thread to run implementations of this trait on.
+/// Note that games only run on that thread, nothing else.
 pub trait Game {
 	/// Do any initalization tasks. Graphics contexts are provided
 	fn init(&mut self, graphics_contexts: &GraphicsContexts, encoder_control: &Control);
@@ -20,7 +23,7 @@ pub trait Game {
 
 	// We'll need input + video frame stuff too
 
-	/// Runs a single frame of the game. Should not sleep, [Game::wait_for_next_frame]
+	/// Runs a single frame of the game. Should not sleep, since [Game::wait_for_next_frame]
 	/// will sleep until the next frame (if required).
 	fn run_frame(&mut self);