📚 DOCS: Fix the code section title in live preview

[welcome[bot]]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.06%. Comparing base (daa00c6) to head (d0eda70).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #875 +/- ## ======================================= Coverage 90.06% 90.06% ======================================= Files 24 24 Lines 3372 3372 ======================================= Hits 3037 3037 Misses 335 335 ``` | [Flag](https://app.codecov.io/gh/executablebooks/MyST-Parser/pull/875/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks) | Coverage Δ | | |---|---|---| | [pytests](https://app.codecov.io/gh/executablebooks/MyST-Parser/pull/875/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks) | `90.06% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks#carryforward-flags-in-the-pull-request-comment) to find out more.

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[welcome[bot]]

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