docs(codegen): correct stale printer comments (#25561)

## Summary

- Correct the three stale codegen comments identified in review.

packages/codegen/src-js/print/class.ts

@@ -108,7 +108,7 @@ export function printClass(node: ESTree.Class, state: State): void {
 }
 
 /**
- * Print a run of decorators, one per line, parenthesizing any whose expression needs it.
+ * Print a run of decorators separated by spaces, parenthesizing any whose expression needs it.
  */
 export function printDecorators(decorators: ESTree.Decorator[], state: State): void {
   const { length } = decorators;

packages/codegen/src-js/print/indent.ts

@@ -13,8 +13,7 @@ import type { State } from "../state.ts";
 /**
  * Write the indentation for the current level, or the pending single space in place of it.
  *
- * Comment printing and inline statement bodies ask for a space where an indent would go,
- * which keeps `if (x) foo()` on one line.
+ * Inline statement bodies ask for a space where an indent would go, which keeps `if (x) foo()` on one line.
  */
 export function printIndent(state: State): void {
   if (state.pendingIndentAsSpace) {

packages/codegen/tsdown.config.ts

@@ -12,7 +12,7 @@ import constFunctionsPlugin from "./tsdown_plugins/const_functions.ts";
 const isEnabled = (env: string | undefined) => env === "true" || env === "1";
 
 // When run with `pnpm run build-dev`, generate a debug build with extra assertions.
-// This is the build to run the conformance suites against - see `conformance/run.mjs`.
+// This is the build prepared by `pnpm run build-test` for conformance tests.
 // It replaces the release build in `dist`, so rebuild with `pnpm run build` before benchmarking.
 const DEBUG = isEnabled(process.env.DEBUG);