[Taler] (docs) code-block style

[Thien-Thi Nguyen]

I am looking to regularlize the code-block style in the docs.git
repo.  At the moment, some of them begin with ‘::’ in the first
column, while others begin with ‘::’ indented a few columns,
while others begin with ‘.. code-block::’.

Any objections to changing all of them to ‘.. code-block::’?
This way we can specify the kind of syntax highlighting, as well
(such as ‘sh’ vs ‘tsref’ vs ‘python’, etc).

-- 
Thien-Thi Nguyen -----------------------------------------------
 (defun responsep (query)               ; (2020) Software Libero
   (pcase (context query)               ;       = Dissenso Etico
     (`(technical ,ml) (correctp ml))
     ...))                              748E A0E8 1CB8 A748 9BFA
--------------------------------------- 6CE4 6703 2224 4C80 7502

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