[PATHC] [DOCS] LangRef: Insert numerous .. code-block:: llvm to colorize examples

[Mikael Lyngvig]

Please ignore this commit if the existing "::" blocks (which makes Sphinx
not colorize the examples) are intentional.

I've gone through and changed a number of cases like this:

::

   [llvm snippet]

into:

.. code-block:: llvm

   [llvm snippet]

Also, I changed three occurences of:

   Syntax::

into:

   Syntax:
   ^^^^^^^^

So that the document becomes more consistent in its use of sections for
syntax examples.

The net effect is that the document becomes more "vivid" or "lively" to
read in its HTML form.


-- Mikael
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