Enhance IS_MAGNETIC flag description on wiki. (#4203)

Author: Phoenixvine32908

docs/content/Modpacks/Materials-and-Elements/Material-Flags.md

@@ -208,7 +208,7 @@ can influence how the material behaves, as well as which items are generated for
     - Required Properties: `PropertyKey.INGOT`.
 
 - `IS_MAGNETIC`
-    - Description: Add this to your Material if it is a magnetized form of another material.
+    - Description: Add this to your Material if it is a magnetized form of another Material. When this flag is on a Material, it macerates into the non-magnetic version of said Material, which is then used for certain crafting recipes.
     - Required Properties: `PropertyKey.INGOT`.
 
 # Gem Flags