Update CONTRIBUTING.md (#1787)

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

Ok that works to but i meant for that to mean 'put all your annotation stuff here' obviously it wont compile, but this works too

Co-authored-by: theminecoder <theminecoder@users.noreply.github.com>

Co-authored-by: YHDiamond <47502993+yehudahrrs@users.noreply.github.com>
Co-authored-by: theminecoder <theminecoder@users.noreply.github.com>

CONTRIBUTING.md

@@ -11,8 +11,8 @@ Thank for for considering a contribution! Generally, Geyser welcomes PRs from ev
 We have some general style guides that should be applied throughout the code:
 
 ```java
-
-private static final AIR_ITEM = 0; // Static item names should be capitalized
+public class LongClassName {
+    private static final int AIR_ITEM = 0; // Static item names should be capitalized
 
     public Int2IntMap items = new Int2IntOpenHashMap(); // Use the interface as the class type but initialize with the implementation.
 
@@ -21,7 +21,11 @@ public int nameWithMultipleWords = 0;
     /**
     * Javadoc comment to explain what a function does.
     */
+    @RandomAnnotation(stuff = true, moreStuff = "might exist")
     public void applyStuff() {
+        Variable variable = new Variable();
+        Variable otherVariable = new Variable();
+
         if (condition) {
 	        // Do stuff.
         } else if (anotherCondition) {
@@ -30,9 +34,12 @@ public void applyStuff() {
 
         switch (value) {
             case 0:
+                stuff();
                 break;
             case 1:
-			break:
+                differentStuff();
+                break;
+        }
     }
 }
 ```