docs: update rust-counter README and fix minor code typo

[binarycryptodev]

Updates the Rust Counter example documentation and fixes a minor syntax issue in the test file.

Changes include:

1. Removed stray backticks in test file (const start = Date.now();`` → `const start = Date.now();), which would have caused a syntax error if executed.

2. Added PRIVATE_KEY placeholder to .env example.

Before:

After:

3. Added backticks around example.env and .env for clarity.
4. Fixed typo in README ("sofware" → "software")

Summary by CodeRabbit

• Documentation

  • Fixed typos and improved formatting in setup instructions.
  • Enhanced code snippet visibility with improved markup.
  • Clarified private key placeholder in configuration guidance.

• Tests

  • Cleaned up formatting in test code.

[vercel]

@binarycryptodev is attempting to deploy a commit to the MagicBlock Labs Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

Walkthrough

This PR contains minor documentation corrections and test file cleanup. The README receives a typo fix, whitespace adjustment, improved code formatting with backticks around file names, and updated placeholder values. A test file has extraneous backticks removed from a line.

Changes

Cohort / File(s)	Summary
Documentation Updates rust-counter/README.md	Fixed typo ("sofware" → "software"), removed unnecessary blank line, added backticks around file references (example.env, .env), and updated PRIVATE_KEY placeholder from empty to <YOUR-PRIVATE-KEY>.
Test Cleanup rust-counter/tests/kit/rust-counter.test.ts	Removed extraneous backticks from the "Initialize counter" test line.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: documentation updates to the README and a minor code typo fix in the test file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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