Docs: Fix typos in Getting Started page

[oyedeletemitope]

I noticed a few typos in the Getting Started docs:

• "an local development" → should be "a local development"
• "comes packages in a Docker container" → should be "comes packaged"
• "we'll moving some tokens" → should be "we'll move"

Happy to submit a PR fixing these if helpful!

[critesjosh]

please do!