fix: typo "Aadd" → "Add" in remark-parse JSDoc

[luojiyin1987]

Summary

Fix a typo in packages/remark-parse/lib/index.js line 14:

- * Aadd support for parsing from markdown.
+ * Add support for parsing from markdown.

The JSDoc comment had a doubled letter in "Aadd" which should be "Add".

Steps to reproduce

1. Open packages/remark-parse/lib/index.js
2. Line 14 reads Aadd instead of Add

Fix

Single-character fix in a comment. No functional change.

[github-actions]

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