SDL2/FrontPage: added links to API structures and enumerations by name

[SDLWikiBot]

This edit was made by @funchucks.

Live page is here: https://wiki.libsdl.org/SDL2/FrontPage

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[funchucks]

I can't tell if only the wiki edit preview is broken, or wiki editing is broken generally. The preview did all of the links wrong, including any that I didn't touch. If it's going to make it the way it previewed, this change definitely shouldn't be approved.

This wiki editing setup is a mess. No wonder serious problems with the wiki are going unfixed. I feel very discouraged both from editing the wiki and using SDL at all.

[icculus]

This change is in (and I've finally fixed the wiki editor previews to not mangle the links, too!)