minetest_docs: edit

pages/minetest_docs.md

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+[minetest_docs](https://github.com/minetest/minetest_docs) was a project that sought out to create better documentation for Minetest. The proposal for the project which included its goals can be found [here](https://gist.github.com/benrob0329/df3ced15dc5a2d5402010be709452f27).
+
+For various reasons the project fell flat and is currently dormant but contains some gems, most of which is available on the Voxelmanip Wiki.
+
+List of pages on the Voxelmanip Wiki that originate from minetest_docs:
+
+- Classes:
+  - [[ModStorage]]
+  - [[Raycast]]
+  - [[Vector API]]
+  - [[VoxelArea]]
+- [[Lua Environment]]
+- [[Modchannels]]
+- [[Object Properties]]
+- [[Persistence]]
+- [[Timing and Event loop]]