remove a blank line in the middle of the code that trip jupyter notebook

Author: forax

chapter02-methods.jsh

@@ -69,7 +69,6 @@ record Rectangle(int width, int height) {
   int area() {
     return width * height;
   }
-  
   static Rectangle createSquare(int side) {
     return new Rectangle(side, side);
   }

guide/chapter02-methods.md

@@ -77,9 +77,6 @@ record Rectangle(int width, int height) {
   int area() {
     return width * height;
   }
-```
-  
-```java
   static Rectangle createSquare(int side) {
     return new Rectangle(side, side);
   }

jupyter/chapter02-methods.ipynb

@@ -104,15 +104,7 @@
   "execution_count": null,
   "metadata": {},
   "outputs": [],
-  "source": ["record Rectangle(int width, int height) {\n", "  int area() {\n", "    return width * height;\n", "  }\n"]
-}
-,
-{
-  "cell_type": "code",
-  "execution_count": null,
-  "metadata": {},
-  "outputs": [],
-  "source": ["  static Rectangle createSquare(int side) {\n", "    return new Rectangle(side, side);\n", "  }\n", "}\n"]
+  "source": ["record Rectangle(int width, int height) {\n", "  int area() {\n", "    return width * height;\n", "  }\n", "  static Rectangle createSquare(int side) {\n", "    return new Rectangle(side, side);\n", "  }\n", "}\n"]
 }
 ,
 {