Update documentation link in rollup-stacks.md

[NeoByteXx]

Changes:
Old: head over to [learn modular] https://celestia.org/learn/
New: head over to [learn modular] https://docs.celestia.org/learn/how-celestia-works/monolithic-vs-modular

Reason:

• Fixed broken link
• Added direct link to modular vs monolithic comparison documentation

Summary by CodeRabbit

• Documentation
  • Updated hyperlink in the "What is a modular blockchain?" section for improved resource accuracy.

[coderabbitai]

Walkthrough

The pull request involves a documentation update in the rollup-stacks.md file, specifically modifying a hyperlink in the "What is a modular blockchain?" section. The change redirects the URL from a general Celestia learning page to a more specific resource about monolithic versus modular blockchain architectures, providing a more targeted reference for readers interested in understanding modular blockchain concepts.

Changes

File	Change Summary
how-to-guides/rollup-stacks.md	Updated hyperlink from https://celestia.org/learn/ to ../learn/how-celestia-works/monolithic-vs-modular

Possibly related PRs

• chore: fix some broken links #1611: Documentation URL updates in Celestia-related guides, suggesting an ongoing effort to refine and correct documentation links.

Poem

🐰 A link, once vague, now sharp and clear,
Guiding learners far and near
From broad to specific, knowledge flows
Where modular blockchain wisdom grows
A rabbit's map, precise and bright! 🔗

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between d620450 and e820d2d.

📒 Files selected for processing (1)

• how-to-guides/rollup-stacks.md (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• how-to-guides/rollup-stacks.md

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