docs: add --static-parse to docs

Author: sheremet-va

docs/guide/cli.md

@@ -121,6 +121,8 @@ tests/test1.test.ts
 tests/test2.test.ts
 ```
 
+Since Vitest 4.1, you may pass `--static-parse` to [parse test files](/api/advanced/vitest#parsespecifications) instead of running them to collect tests. Vitest parses test files with limited concurrency, defaulting to `os.availableParallelism()`. You can change it via the `--static-parse-concurrency` option.
+
 ## Shell Autocompletions
 
 Vitest provides shell autocompletions for commands, options, and option values powered by [`@bomb.sh/tab`](https://github.com/bombshell-dev/tab).