fix: typo and grammatical issue

[xjwllmsx]

Description

This PR corrects a typo and grammatical mistakes in the 1st paragraph of "How to Contribute to Open Source"

Related Tickets & Documents

Fixes #255

Mobile & Desktop Screenshots/Recordings

Original (branch main):

PR will fix to display:

Steps to QA

• Navigate to https://github.com/xjwllmsx/intro/blob/fix-typo/docs/intro-to-oss/how-to-contribute-to-open-source.md
  • Note the first paragraph starts with: "One of the first challenges you might face when learning how to contribute to open source..."
  • Note that the original first paragraph starts with: "One of the first challenges you might face when getting learning how to contribute in open source..."

Tier (staff will fill in)

• Tier 1
• Tier 2
• Tier 3
• Tier 4

[optional] What gif best describes this PR or how it makes you feel?

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[adiati98]

Hey @xjwllmsx,

This looks good. Thank you for the fix! ✨