Chore/trailing slashes cleanup

[briwylde08]

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[stellar-jenkins-ci]

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[JFWooten4]

Re @ElliotFriend in #2583 (comment) - keeping the thread going to merge this. You can see the original logic inspiring these changes in #2396. That logic hinged around easing the review scanning lifecycle to fix an example error in JFWooten4@425749f.

I like that trailingSlash is false in the Docusaurus config a lot. In my regulatory drafting, many government sources don't include that, and it makes direct URLs look stylistically abysmal in final compilations. I've implemented tooling to bulk remove them at no consequential procedural cost, because they led to a factual error and incorrect citation in my last comment.

With the larger focus on internal docs links, I think this reinforces a standard of clean code. The internal .mdx#{tag} refs don't use trailing slashes, and neither should external page refs. I've made style difference changes like that before in github/.github#447, and I guess you could say they're from my instinct as a writer for the last decade more than a definitive source.