Fix GDExtension documentation disappearing after hot-reload #91126
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Fixes #76796
Currently, unless a GDExtension provides its own documentation by submitting XML data, its classes will be removed from the editors docs on a successful hot-reload.
This PR fixes that, by re-generating the docs after any extensions have been hot-reloaded.
Works in my testing, both with GDExtensions that provide XML docs data, and those that don't!