[HTML] document navigation should reflect the currently selected overload

[Nicholas Berlette]

When viewing a symbol that has many overloads, the document navigation gets a bit... cluttered.

Take a look at the attached screenshot, which has several well-documented overloads for a single function named titleCase. All of the overloads are included in the sidebar, but because only the selected one is visible in the DOM, only a few of the links in the sidebar actually work. And there's no indicator which ones they are, since the same names are repeated for each overload.

The navigation should only include links that are to actively navigable content that's currently visible. Currently this is an accessibility nightmare.

Also, I think the example sections should be consolidated into a single Examples link. It's confusing to have five links that each say "Examples", but only link to a single example each. Just my two cents.

Thanks!