Update python-variables.md with closing

Author: steam-bell-92

docs/python/python-variables.md

@@ -91,7 +91,7 @@ def = 30        # 'def' is a keyword
 Python variables can hold different types of data:
 
 
-  <img src="./assets/data-type.png" alt='data-type table'>
+  <img src="./assets/data-type.png" alt="data-type table" />
 
 ### 6. Type Checking with `type()`
 
@@ -237,4 +237,4 @@ Items: ['pen', 'notebook']
 * Covers both global and local variables
 * Explains `del`, `global`, and `id()` functions
 * Includes formatted tables and output blocks
-* Beginner-friendly explanation with examples
+* Beginner-friendly explanation with examples