docs: Fix output format in meta.yaml for alignoth wrapper (#4744)

Fixes #4743 

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Restructured output configuration format to use list structure for
improved consistency and maintainability.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: fxwiegand

bio/alignoth/meta.yaml

@@ -12,7 +12,8 @@ input:
   - vcf: Path to indexed VCF file (Optional)
   - vcf_idx: Path to index of VCF file (required when VCF is used)
   - bed: Path to BED file (Optional)
-output: "HTML, JSON or directory path"
+output:
+  - HTML, JSON or directory path
 authors:
   - Felix Wiegand
 params: