Improve docs template helper properties.js

[Marcofann]

1. Bug Fix in returns2 helper:

   • Fixed a TypeError by correcting the property access for VariableDeclaration nodes.
   • Before: item.typeDescriptions.typeString (incorrect)
   • After: item.typeName.typeDescriptions.typeString (correct)

2. Improved Error Message in inheritance helper:

   • Clarified the error message to be more descriptive and accurate.
   • Before: used inherited-items on non-contract
   • After: inheritance modifier used on non-contract

3. Code Refactoring in functions helper:

   • Removed a redundant array spread [...[...findAll()]]. findAll() already returns an iterable that can be filtered directly.

PR Checklist

• Tests (No new tests needed as this fixes existing template logic)
• Documentation (Changes are internal to the doc generator)
• Changeset entry (run npx changeset add)

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Latest commit: 2f6e291

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[ernestognw]

Thanks!

[arr00]

@Marcofann @ernestognw this broke local docs generation for me. Reverting the changes on line 68,69 fixes it. Running node v20.19.5.

Error:

findAll.filter is not a function or its return value is not iterable

#6221