Fix .. code-block :: directives in decimal.rst

[asottile]

without this, the docs build fails due to this:

Warning, treated as error:
/tmp/code/Doc/c-api/decimal.rst:19:Error in "code-block" directive:
1 argument(s) required, 0 supplied.

.. code-block::

    #include "pydecimal.h"

    static int decimal_initialized = 0;
    if (!decimal_initialized) {
        if (import_decimal() < 0) {
            return NULL;
        }

        decimal_initialized = 1;
    }

[miss-islington]

Thanks @asottile for the PR, and @pablogsal for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8, 3.9.
🐍🍒⛏🤖

[miss-islington]

Sorry @asottile and @pablogsal, I had trouble checking out the 3.9 backport branch.
Please backport using cherry_picker on command line.
cherry_picker d5752aa5c91c56910efe226d0a000bb4481e4f87 3.9

[miss-islington]

Sorry, @asottile and @pablogsal, I could not cleanly backport this to 3.8 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker d5752aa5c91c56910efe226d0a000bb4481e4f87 3.8

[pablogsal]

@asottile Could you do the backports, please?

[miss-islington]

Thanks @asottile for the PR, and @pablogsal for merging it 🌮🎉.. I'm working now to backport this PR to: 3.9.
🐍🍒⛏🤖

[miss-islington]

Sorry @asottile and @pablogsal, I had trouble checking out the 3.9 backport branch.
Please backport using cherry_picker on command line.
cherry_picker d5752aa5c91c56910efe226d0a000bb4481e4f87 3.9

[pablogsal]

Actually, nevermind, there is no Doc/c-api/decimal.rst

[asottile]

yep this one is only for 3.10 :) -- sorry I didn't catch this earlier, but the nightly deadsnakes builds have docs disabled because they break so often