Update "Exporting for the Web" to include 4.3 features

[adamscott]

The Exporting for the Web page is horribly outdated, especially with the 4.3 changes.

Sorry for that, I completely forgot to update it when I created the new features.

Features:

• changes the warning about SharedArrayBuffer into a note, as this was pretty much "fixed" with the single-threaded exports.
• removes the warning about macOS and iOS incompatibility.
• removes mentions of the splash screen not displaying (https://github.com/godotengine/godot/pull/91128 was merged for 4.3)
• edit a warning about exporting the game and installation issues (mentions now that applies only for threaded exports)

Bugsquad edit: closes #9983

[skyace65]

Please don't use the 4.4 milestone unless it's for a change that only applies to 4.4

[mhilbrunner]

@adamscott Friendly reminder bump!

[adamscott]

@adamscott Friendly reminder bump!

Oops. I didn't see that the build failed. Gonna fix that tomorrow morning.

[mak448a]

Any updates on this getting merged? Have you gotten the builds to stop failing?

[adamscott]

Just updated the PR. Should work, now.

[skyace65]

Thanks!

[adamscott]

Thanks to you, @skyace65 !