[NU-1836] Adjust SpeL conversion docs

[lukasz-bigorajski]

Describe your changes

Checklist before merge

• [ ] Related issue ID is placed at the beginning of PR title in [brackets] (can be GH issue or Nu Jira issue)
• [ ] Code is cleaned from temporary changes and commented out lines
• [ ] Parts of the code that are not easy to understand are documented in the code
• [ ] Changes are covered by automated tests
• [ ] Showcase in dev-application.conf added to demonstrate the feature
• [ ] Documentation added or updated
• [ ] Added entry in Changelog.md describing the change from the perspective of a public distribution user
• [ ] Added MigrationGuide.md entry in the appropriate subcategory if introducing a breaking change
• [ ] Verify that PR will be squashed during merge

Summary by CodeRabbit

• Documentation
  • Enhanced clarity and readability of the SpEL documentation.
  • Expanded sections on data types, implicit and explicit conversions.
  • Improved examples for filtering and transforming lists.
  • Updated conversion matrix for better understanding of type relationships.

[coderabbitai[bot]]

📝 Walkthrough

## Walkthrough The pull request introduces several modifications to the `Spel.md` document, which focuses on Spring Expression Language (SpEL) within the Nussknacker framework. The updates aim to enhance clarity and readability by rephrasing and restructuring existing content. Notable changes include the removal of redundant phrases and an expansion of the data types section to better differentiate between Java types and their representations in JSON and Avro formats. The explanations regarding implicit and explicit conversions have been refined, highlighting the availability of utility classes alongside built-in functions. Additionally, the conversion matrix has been updated for improved clarity. The document now features more structured examples, particularly in the sections on filtering and transforming lists, with clearer syntax for accessing elements and invoking methods. Overall, these changes are designed to improve the instructional quality of the document, facilitating a better understanding of SpEL concepts and functionalities. ## Possibly related PRs - #7124: The changes in this PR also focus on enhancing the documentation related to type conversions in SpEL, which aligns with the main PR's updates on clarifying conversions and data types. ## Suggested labels `docs` ## Suggested reviewers - ZbyszekMM - arkadius

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