doc: tools, dev: Add caption and box for verbatim.

doc/dev/documentation.org

@@ -115,6 +115,7 @@ source code: https://orgmode.org/org.html#Working-with-Source-Code
 
 Here is an example for python source code:
 #+BEGIN_EXAMPLE
+#+CAPTION: Get os type name in Python code
 #+begin_src python
 import os
 
@@ -125,6 +126,7 @@ print(f"Document build on system: {os.name}")
 If you use GNUEmacs, it is also possible to run the code inside a
 block and export (or not) the reuslts in the document.
 
+#+CAPTION: Get os type name in Python code
 #+begin_src python :python python3 :results output :exports both :noweb yes
 import os