Corrected broken links to documentation

Data structures/Lists introduction/task.md

@@ -15,7 +15,7 @@ squares + [36, 49, 64, 81, 100]
 [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
 ```
 
-You can explore lists in more detail by reading <a href="https://docs.python.org/3.9/tutorial/introduction.html#lists">this page</a>.
+You can explore lists in more detail by reading <a href="https://docs.python.org/3/tutorial/introduction.html#lists">this page</a>.
 
 
 ### Task

Strings/String formatting/task.md

@@ -9,7 +9,7 @@ or decimal values.
 > of quirks that lead to a number of common errors. 
 > Using the newer formatted string literals (see [further](course://Strings/F-strings)), 
 > the <code><a href="https://docs.python.org/3/library/stdtypes.html#str.format">str.format()</a></code> 
-> interface, or <a href="https://docs.python.org/3/library/string.html#template-strings">template strings</a> may help avoid these errors. 
+> interface, or <a href="https://docs.python.org/3/library/string.html#template-strings-strings">template strings</a> may help avoid these errors. 
 > Each of these alternatives provides their own trade-offs and benefits of 
 > simplicity, flexibility, and/or extensibility.</i>