Copy edit the docs: a the -> the

[earldouglas]

[ci skip]

---

Please include the following checklist in your PR:

• Patches conform to the coding conventions.
• Any changes that could be relevant to users have been recorded in the changelog.
• The documentation has been updated, if necessary.
• If the change is docs-only, [ci skip] is used to avoid triggering the build bots.

Please also shortly describe how you tested your change. Bonus points for added tests!

[23Skidoo]

Merged, thanks!

[earldouglas]

Thanks, @23Skidoo!

* If the change is docs-only, `[ci skip]` is used to avoid triggering the build bots.

Did I use this correctly? It looks like the CI system still triggered.

[23Skidoo]

AppVeyor requires [ci skip] to be on the first line.