Minor typos corrected in the data hazard workshop case study - possible to move this under online events chapter

[malvikasharan]

Summary

• Minor typos fixed and corrected a 'note' box formatting

List of changes proposed in this PR (pull-request)

• A case study under data hazard chapter may include a repository that uses data hazard label so the readers can refer to that and learn how they can structure their repo to include labels
• While reading this, I thought that the chapter fits as a case study for organising online events thoughfully, and can potentially be moved - would love to hear what @CeilidhWelsh and @Susana465 think

What should a reviewer concentrate their feedback on?

• Everything looks ok - in terms of typos corrected?
• Maybe discussion on moving this chapter can happen here and if agreed, edit to move the file can also take place here - or moved to an issue/new PR

Acknowledging contributors

• All contributors to this pull request are already named in the table of contributors in the README file.
• The following people should be added to the table of contributors in the README file:

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[malvikasharan]

@Susana465 @CeilidhWelsh can I please draw your attention to this PR. 🙏

[Susana465]

Briefly discussed with @aleesteele @CeilidhWelsh - currently no time to address but have not forgotten and will tackle soon.

[da5nsy]

Reviewing spelling and grammar