👌 Show text of `text_special` in `tree.pretty`

[chrisjsewell]

Provides a demonstration of how the new text_special token parsing works

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (dd51f62) 95.16% compared to head (8750c2b) 95.16%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #282 +/- ## ======================================= Coverage 95.16% 95.16% ======================================= Files 64 64 Lines 3434 3434 ======================================= Hits 3268 3268 Misses 166 166 ``` | Flag | Coverage Δ | | |---|---|---| | pytests | `95.16% <100.00%> (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. | [Impacted Files](https://app.codecov.io/gh/executablebooks/markdown-it-py/pull/282?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks) | Coverage Δ | | |---|---|---| | [markdown\_it/tree.py](https://app.codecov.io/gh/executablebooks/markdown-it-py/pull/282?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=executablebooks#diff-bWFya2Rvd25faXQvdHJlZS5weQ==) | `92.22% <100.00%> (ø)` | |

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