Minor typo fix (#251)

Author: MrAmericanMike

content/docs/en/guides/plugin/world-gen.mdx

@@ -100,7 +100,7 @@ Biome biome = biomeGen.generateBiomeAt(zoneResult, seed, x, z);
 
 ### Zone & Cave Integration
 
-Eacdh zone defines it's own cave patterns:
+Each zone defines it's own cave patterns:
 
 ```java
 Zone zone = /* ... */;