Updates to Embedded Systems Chapter

[Ekhao]

This pull request makes relatively small changes to the embedded systems chapter. Namely it fixes a paragraph on ARM sales figures that could be misunderstood and rewrites the real time scheduling subsection to discuss how static schedules can be used to guarantee response times instead of discussing priority scheduling which also exist in non-real time scheduling.

The checklist below seems to be meant for full chapter contributions, but I have filled it out the best I could!

1. Content

   • The chapter content is complete and covers the topic in detail.
   • All technical terms are well-defined and explained.
   • Any code snippets or algorithms are well-documented and tested.
   • The chapter follows a logical flow and structure.

2. References & Citations

   • All references are correctly listed at the end of the chapter.
   • In-text citations are used appropriately and match the references.
   • All figures, tables, and images have proper sources and are cited correctly.

3. Quarto Website Rendering

   • The chapter has been locally built and tested using Quarto.
   • All images, figures, and tables render properly without any glitches.
   • All images have a source or they are properly linked to external sites.
   • Any interactive elements or widgets work as intended.
   • The chapter's formatting is consistent with the rest of the book.

4. Grammar & Style

   • The chapter has been proofread for grammar and spelling errors.
   • The writing style is consistent with the rest of the book.
   • Any jargon is clearly explained or avoided where possible.

5. Collaboration

   • All group members have reviewed and approved the chapter.
   • Any feedback from previous reviews or discussions has been addressed.

6. Miscellaneous

   • All external links (if any) are working and lead to the intended destinations.
   • If datasets or external resources are used, they are properly credited and linked.
   • Any necessary permissions for reused content have been obtained.

7. Final Steps

   • The chapter is pushed to the correct branch on the repository.
   • The Pull Request is made with a clear title and description.
   • The Pull Request includes any necessary labels or tags.
   • The Pull Request mentions any stakeholders or reviewers who should take a look.