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

• [X] 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

• [X] I have checked there is no other PR open for the same change.
• [X] I have read the Contribution Guidelines.
• [X] 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.
• [X] I have verified that the code complies with the projects coding standards.
• [ ] [Required for new sniffs] I have added XML documentation for the sniff.