docs: update tetris-optimizer's all example's header

subjects/tetris-optimizer/badexample00.md

@@ -1,4 +1,4 @@
-## bad example
+## bad example 00
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/badexample01.md

@@ -1,4 +1,4 @@
-## bad example
+## bad example 01
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/badexample02.md

@@ -1,4 +1,4 @@
-## bad example
+## bad example 02
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/badexample03.md

@@ -1,4 +1,4 @@
-## bad example
+## bad example 03
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/badexample04.md

@@ -1,4 +1,4 @@
-## bad example
+## bad example 04
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/goodexample00.md

@@ -1,4 +1,4 @@
-## good example
+## good example 00
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/goodexample01.md

@@ -1,4 +1,4 @@
-## good example
+## good example 01
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/goodexample02.md

@@ -1,4 +1,4 @@
-## good example
+## good example 02
 
 - Create your file and copy the example into it.
 

subjects/tetris-optimizer/goodexample03.md

@@ -1,4 +1,4 @@
-## good example
+## good example 03
 
 - Create your file and copy the example into it.