Fix spacing for code blocks

day2/README.md

@@ -45,8 +45,11 @@ For the purposes of illustration, here is the same program split into multiple
 lines:
 
 1,9,10,3,
+
 2,3,11,0,
+
 99,
+
 30,40,50
 
 The first four integers, 1,9,10,3, are at positions 0, 1, 2, and 3. Together,
@@ -58,8 +61,11 @@ this value at the output position; here, the output position (3) is at position
 3, so it overwrites itself. Afterward, the program looks like this:
 
 1,9,10,70,
+
 2,3,11,0,
+
 99,
+
 30,40,50
 
 Step forward 4 positions to reach the next opcode, 2. This opcode works just
@@ -68,8 +74,11 @@ positions 3 and 11; these positions contain 70 and 50 respectively. Multiplying
 these produces 3500; this is stored at position 0:
 
 3500,9,10,70,
+
 2,3,11,0,
+
 99,
+
 30,40,50
 
 Stepping forward 4 more positions arrives at opcode 99, halting the program.