feat(curriculum): Add an example of invalid syntax for an if-else block (#66399)

Co-authored-by: majestic-owl448 <26656284+majestic-owl448@users.noreply.github.com>
Co-authored-by: Aditya Singh <anshul8303858511@gmail.com>
Co-authored-by: Huyen Nguyen <25715018+huyenltnguyen@users.noreply.github.com>

curriculum/challenges/english/blocks/lecture-booleans-and-conditionals/67fe85a3db9bad35f2b6a2bd.md

@@ -106,6 +106,18 @@ else:
     print('You are not an adult yet') # You are not an adult yet
 ```
 
+Note that you cannot place any statements between the `if` block and the `else` clause. The following code would raise a `SyntaxError`:
+
+```python
+age = 12
+
+if age >= 18:
+    print('You are an adult')
+print('Almost there!')
+else: # SyntaxError: invalid syntax
+    print('You are not an adult yet')
+```
+
 There might be situations in which you want to account for multiple conditions. To do that, Python lets you extend your if statement with the `elif` (else if) keyword.
 
 Here's the syntax: