docs: Correct semi-colon for semicolon (without dash)

[DannyvdSluijs]

Semicolon is the correct spelling based on the Oxford Dictionary and dictionary.com. This PR changes all occurrences found into semicolon

Description

This PR is a split on changes proposed earlier in #457 but limiting to only fixing typos of the word semicolon.
Sources for the correct spelling are:

• https://www.oed.com/dictionary/semicolon_n?tab=factsheet#23549945
• https://www.dictionary.com/browse/semicolon
• https://en.bab.la/dictionary/english/semicolon
• https://en.wikipedia.org/wiki/Semicolon

Also Google trends show a difference between semicolon and semi-colon

Suggested changelog entry

Correct semi-colon with semicolon

Related issues/external references

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
  • This change is only breaking for integrators, not for external standards or end-users.
• Documentation improvement

PR checklist

• I have checked there is no other PR open for the same change.
• I have read the Contribution Guidelines.
• I grant the project the right to include and distribute the code under the BSD-3-Clause license (and I have the right to grant these rights).
• I have added tests to cover my changes.
• I have verified that the code complies with the projects coding standards.
• [Required for new sniffs] I have added XML documentation for the sniff.

[jrfnl]

Hi @DannyvdSluijs Thank you for doing this!

Looking good. I just have two small remarks for you to look at, but other than that, good to go.

[jrfnl]

Thanks @DannyvdSluijs for working on this. All good now.