Fix typo: "responsivness" → "responsiveness" in finding-good-first-issues.md

[mergeworthy]

There's a typo in one of the section headings in the "Finding good first issues" guide — responsivness is missing an e.

Where

guides/finding-good-first-issues.md, the section heading:

Maintainer responsivness

What it should say

Maintainer responsiveness

Acceptance criteria

• responsivness is replaced with responsiveness in the heading.
• No other text in the file is changed (the heading change should not affect anchor links elsewhere — none reference this section).
• The PR is small and focused.

Estimated time

~5 minutes.

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[guvennsade-tech]

Fixed in #32

[guvennsade-tech]

Fixed in #32