selfhost/cmd/wcc/typ: drop ty_ prefix underscore on tctx primitives

selfhost/cmd/wcc/cgen.ww

@@ -1607,7 +1607,7 @@ fn cgexpr(c: *cgen, n: *node) void = {
 		// Module-qualified value reference: `mod.name` where `mod`
 		// is N_IDENT bound as SK_USE and the leaf isn't a local.
 		// Treat as a SB symbol — `MOVQ leaf(SB), AX`. Same fallback
-		// the C cgen takes when bt is NULL/ty_err.
+		// the C cgen takes when bt is NULL/tyerr.
 		if (lhs != nil) {
 			if (lhs.kind == N_IDENT) {
 				emitline("\tMOVQ\t");