fix: correct typos across multiple chapters

[bhdai]

I found several typos while reading through the book. All changes are minor corrections to improve readability and do not alter the content or meaning of the text.

Changes made:

• Fixed spelling errors in chapter 5, 7, 8, 9 and 11.
• Corrected grammatical issues in chapter 3 and 17.

[review-notebook-app[bot]]

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