Fix typos in README.md and airflow_doc_issue_report.yml

[treyyi]

What do you see as an issue?

Just found small typos as below:

1. Missing a period symbol right after the sentence

• File Location: README.md
• Simply added a period at the end of the sentence: "...it is effectively removed when we release the first new MINOR (Or MAJOR if there is no new MINOR version) of Airflow."

2. Typo in Airflow Doc issue report

• File Location: .github/ISSUE_TEMPLATE/airflow_doc_issue_report.yml
• Changed "eequest" to "request"

Solving the problem

Simply fix them as explained above and will make a PR for this!

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct