fix typo in comment and unused variable remove (#45307)

<!--
Thanks for opening a PR! Your contribution is much appreciated.
To make sure your PR is handled as smoothly as possible we request that
you follow the checklist sections below.
Choose the right checklist for the change that you're making:
-->

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the
feature request has been accepted for implementation before opening a
PR.
- [ ] Related issues linked using `fixes #number`
- [ ]
[e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs)
tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm build && pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing
doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)

bench/recursive-copy/run.js

@@ -12,7 +12,7 @@ const createSrcFolder = async () => {
 
   const files = new Array(100)
     .fill(undefined)
-    .map((x, i) =>
+    .map((_, i) =>
       join(srcDir, `folder${i % 5}`, `folder${i + (1 % 5)}`, `file${i}`)
     )
 

scripts/publish-native.js

@@ -70,7 +70,7 @@ const cwd = process.cwd()
         } finally {
           publishSema.release()
         }
-        // lerna publish in next step sill fail if git status is not clean
+        // lerna publish in next step will fail if git status is not clean
         await execa(
           `git`,
           [