chore(cli): add clarifying comment (vercel#62418)

## Changes

- Add clarifying comment around why we're `process.exit(1)` at the end
of `runLintCheck`
- Related → vercel#62378

Closes NEXT-2576

packages/next/src/cli/next-lint.ts

@@ -189,6 +189,8 @@ const nextLint: CliCommand = async (args) => {
       } else if (lintResults && !lintOutput) {
         printAndExit(green('✔ No ESLint warnings or errors'), 0)
       } else {
+        // this makes sure we exit 1 after the error from line 116
+        // in packages/next/src/lib/eslint/runLintCheck
         process.exit(1)
       }
     })