Update 12_programming.adoc

modules/networking/slides-v4/12_programming.adoc

@@ -161,7 +161,7 @@ image::slide_background_fade.png[background, size=100%]
 
 
 
-=== Built-In Functions
+=== https://docs.python.org/3/library/functions.html[Built-In Functions, window=_blank]
 
 * int()
 * len()
@@ -173,7 +173,7 @@ image::slide_background_fade.png[background, size=100%]
 
 
 
-=== Built-In Methods
+=== https://docs.python.org/3/library/stdtypes.html#string-methods[Built-In Methods, window=_blank]
 
 * my_string.upper()
 * my_string.lower()