Onchain development - Updated Intro to onchain lesson

[0xCipherCoder]

Problem

Summary of Changes

• Updated content to be more understandable
• Added code snippet with latest changes
• Fixed grammar issue and styling

Fixes #

[0xCipherCoder]

Great work, again, particularly on the PDA example just needs some small issues fixed. Note @0xCipherCoder you haven't won this one - there was already an update we've accepted as the winner - however if you fix the conflicts we'd love to get this work into the lesson.

Thanks! @mikemaccana I have merged the main branch and resolved the conflict along with comments. I have tried to keep the best of both. Please review it once and let me know if any additional changes are required.

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[mikemaccana]

@nickfrosty sure you don't want to merge it? It's good work.

[nickfrosty]

To me, this reads as the same info with no meaningful change