Update distant_horizons.mdx

Updated it to include DH_BLOCK_GRASS cause apparently that exists lol

Author: Negurulxvv

src/content/docs/current/Reference/Mod Support/distant_horizons.mdx

@@ -109,7 +109,8 @@ DH_BLOCK_LEAVES // All types of leaves, bamboo, or cactus
 DH_BLOCK_STONE // Stone or ore
 DH_BLOCK_WOOD // Any wooden item
 DH_BLOCK_METAL // Any block that emits a metal or copper sound.
-DH_BLOCK_DIRT // Dirt, grass, podzol, and coarse dirt.
+DH_BLOCK_DIRT // Dirt, podzol, and coarse dirt.
+DH_BLOCK_GRASS // Grass.
 DH_BLOCK_LAVA // Lava.
 DH_BLOCK_DEEPSLATE // Deepslate, and all it's forms.
 DH_BLOCK_SNOW // Snow.