docs(readme): Fix infra path typo and license spelling

[jihanurrahman33]

Small documentation improvements:

• Fixes a path typo: infa/<package> -> infra/<package> in Testing section.
• Uses “licensed” in “This repo is licensed under MIT.”

No code changes.

[coveralls]

Pull Request Test Coverage Report for Build 17386818701

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 80.733%

---

Totals
Change from base Build 17250569655:	0.0%
Covered Lines:	3105
Relevant Lines:	3846

---

💛 - Coveralls

[Vinzent03]

Thanks for the fix!