Docs: Added Indenter

[codecov-commenter]

Codecov Report

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

Project coverage is 89.53%. Comparing base (53c3964) to head (8464e3f). Report is 2 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1423 +/- ## ========================================== + Coverage 89.41% 89.53% +0.11% ========================================== Files 52 52 Lines 7744 7813 +69 ========================================== + Hits 6924 6995 +71 + Misses 820 818 -2 ``` | [Flag](https://app.codecov.io/gh/lark-parser/lark/pull/1423/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lark-parser) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/lark-parser/lark/pull/1423/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=lark-parser) | `89.53% <ø> (+0.11%)` | :arrow_up: | 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=lark-parser#carryforward-flags-in-the-pull-request-comment) to find out more.

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[erezsh]

Good idea, thanks.

[dangduomg]

the changes don't appear in readthedocs.io https://lark-parser.readthedocs.io/en/stable/classes.html there is no Indenter reference in there

[erezsh]

True, but they are now on latest: https://lark-parser.readthedocs.io/en/latest/classes.html#indenter

Once we release 1.2.0, I'll update stable too.