Refactor: Rename offset parameter and add JavaDoc

- Renamed parameter 'i' to 'distance' in Vector3i, Vector3f, and Vector3d to improve code readability.
- Added JavaDoc to offset methods to explain the functionality as requested.

api/src/main/java/com/github/retrooper/packetevents/util/Vector3d.java

@@ -189,8 +189,15 @@ public class Vector3d {
         return add(face.getModX(), face.getModY(), face.getModZ());
     }
 
-    public Vector3d offset(BlockFace face, int i) {
-        return i == 0 ? this : add(face.getModX() * i, face.getModY() * i, face.getModZ() * i);
+    /**
+     * Offsets the vector by a specific BlockFace direction and distance.
+     *
+     * @param face     The direction in which to offset.
+     * @param distance The distance to offset in that direction.
+     * @return A new Vector3d with the calculated offset.
+     */
+    public Vector3d offset(BlockFace face, int distance) {
+        return distance == 0 ? this : add(face.getModX() * distance, face.getModY() * distance, face.getModZ() * distance);
     }
 
     public Vector3d subtract(double x, double y, double z) {

api/src/main/java/com/github/retrooper/packetevents/util/Vector3f.java

@@ -150,8 +150,15 @@ public class Vector3f {
         return add(face.getModX(), face.getModY(), face.getModZ());
     }
 
-    public Vector3f offset(BlockFace face, int i) {
-        return i == 0 ? this : add(face.getModX() * i, face.getModY() * i, face.getModZ() * i);
+    /**
+     * Offsets the vector by a specific BlockFace direction and distance.
+     *
+     * @param face     The direction in which to offset.
+     * @param distance The distance to offset in that direction.
+     * @return A new Vector3f with the calculated offset.
+     */
+    public Vector3f offset(BlockFace face, int distance) {
+        return distance == 0 ? this : add(face.getModX() * distance, face.getModY() * distance, face.getModZ() * distance);
     }
 
     public Vector3f subtract(float x, float y, float z) {

api/src/main/java/com/github/retrooper/packetevents/util/Vector3i.java

@@ -217,8 +217,15 @@ public class Vector3i {
         return add(face.getModX(), face.getModY(), face.getModZ());
     }
 
-    public Vector3i offset(BlockFace face, int i) {
-        return i == 0 ? this : add(face.getModX() * i, face.getModY() * i, face.getModZ() * i);
+    /**
+     * Offsets the vector by a specific BlockFace direction and distance.
+     *
+     * @param face     The direction in which to offset.
+     * @param distance The distance to offset in that direction.
+     * @return A new Vector3i with the calculated offset.
+     */
+    public Vector3i offset(BlockFace face, int distance) {
+        return distance == 0 ? this : add(face.getModX() * distance, face.getModY() * distance, face.getModZ() * distance);
     }
 
     public Vector3i subtract(int x, int y, int z) {