Fix #673 duplicate callouts

[SDGGiesbrecht]

Fixed #673 by normalizing capitalization before filtering special callouts (Parameter, Returns). Also added the callout Parameters for consistency. (See the list of callouts in Swift’s API Design Guidelines)

You can run the following commands to see the problem. (You’ll have to manually expand one of the functions once the documentation pops up.)

git clone https://github.com/SDGGiesbrecht/SDGLogic
cd SDGLogic
swift package generate-xcodeproj
jazzy
open docs/Functions.html
cd ..

Run the commands again with jazzy built from this branch and you will see that the duplicate callouts are gone.

[DangerCI]

	1 Warning
⚠️	This PR may need tests.

Generated by 🚫 danger

[SDGGiesbrecht]

I rearranged the code slightly to pass RuboCop.

[pigeondotdev]

Thanks for filing this PR! Everything looks good to me but I'll let @jpsim or someone else merge this one in. 😸

[jpsim]

Thanks for the PR @SDGGiesbrecht!