Document (unreleased) multiline comments

## 📚 Description

Based on this comment: https://github.com/phel-lang/phel-lang/pull/931#pullrequestreview-3171693822

Add multiline comments using "Common Lisp" syntax for multiline comments.

- `#|` as start
- `|#` as ending


<img width="801" height="643" alt="Image" src="https://github.com/user-attachments/assets/f8146803-36c7-41a9-8657-cfc4f0a1540b" />


### 📍 **src**: https://phel-lang.org/documentation/basic-types/#comments

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Document (unreleased) multiline comments #142

📚 Description

📍 src: https://phel-lang.org/documentation/basic-types/#comments

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Document (unreleased) multiline comments #142

Description

📚 Description

📍 src: https://phel-lang.org/documentation/basic-types/#comments

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