[OSPO Book] Chapter 2 and 3 about ospology HOT 7 OPEN

Created a pull request with a few typos fixed (#489).
This pull request can be used to fix all of chapter 2 and 3.

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@alice-sowerby, keeping this issue open in case there's a final review pending for the chapters or its good to close! I have merged the #489

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@anajsana thanks for adding this. I didn't spot it - please feel free to name check @todogroup/ospology-book-reviewers to get us to take a look (maybe there is a way to automate this when a task is put in this col).

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@alice-sowerby @souravcipher I created this task to work in the final review today during the chapter 2 and 3 review call. Hopefully, it will be able to be closed by the end of this week or the next one (depends on how the review goes)

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@anajsana @todogroup/ospology-book-reviewers @todogroup/ospology-book-content I have done a review of chapter 2 and 3, mainly copy editing.

Chapter 2
Chapter 3

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@alice-sowerby final PR waiting for your approval before merge! #497

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@anajsana I have reviewed and requested some small changes (typos mainly)

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