Add named composite state example to stateDiagram-v2

[cbugk]

:bookmark_tabs: Summary

Although this can be deduced from naming a state, performing it in a one-liner should not be assumed. So having an explicit example is better IMO.

Resolves #5474

:straight_ruler: Design Decisions

Just defined a named state, and then populated it, alongside the first example of composites. This is not propagated to following examples though.

:clipboard: Tasks

Make sure you

• [x] :book: have read the contribution guidelines
• [ ] :computer: have added necessary unit/e2e tests.
• [x] :notebook: have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• [x] :bookmark: targeted develop branch

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[codecov[bot]]

Codecov Report

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

Project coverage is 5.72%. Comparing base (47c5abb) to head (3000f02).

Additional details and impacted files

[](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5485?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) ```diff @@ Coverage Diff @@ ## develop #5485 +/- ## ========================================== - Coverage 5.73% 5.72% -0.01% ========================================== Files 277 278 +1 Lines 42002 42013 +11 Branches 515 490 -25 ========================================== Hits 2407 2407 - Misses 39595 39606 +11 ``` | [Flag](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5485/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5485/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js) | `5.72% <ø> (-0.01%)` | :arrow_down: | 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=mermaid-js#carryforward-flags-in-the-pull-request-comment) to find out more. [see 1 file with indirect coverage changes](https://app.codecov.io/gh/mermaid-js/mermaid/pull/5485/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=mermaid-js)

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