docs: update the specs links (backport #2637) (#2642)

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Co-authored-by: CHAMI Rachid <[email protected]>

pkg/wrapper/README.md

@@ -76,9 +76,9 @@ One namespace ID is located in the first `NamespaceIDSize` bytes, while the othe
 ## References
 
 - Namespaced Merkle tree specifications: <https://github.com/celestiaorg/nmt/blob/master/docs/spec/nmt.md>
-- Celestia original data square specification: <https://github.com/celestiaorg/celestia-app/blob/specs-staging/specs/src/specs/data_structures.md#arranging-available-data-into-shares>
-- Celestia constants: <https://github.com/celestiaorg/celestia-app/blob/specs-staging/specs/src/specs/consensus.md#constants>
-- Celestia reserved namespace IDs: <https://github.com/celestiaorg/celestia-app/blob/specs-staging/specs/src/specs/consensus.md#reserved-namespace-ids>
+- Celestia original data square specification: <https://github.com/celestiaorg/celestia-app/blob/main/specs/src/specs/data_structures.md#arranging-available-data-into-shares>
+- Celestia constants: <https://github.com/celestiaorg/celestia-app/blob/main/specs/src/specs/consensus.md#constants>
+- Celestia reserved namespace IDs: <https://github.com/celestiaorg/celestia-app/blob/main/specs/src/specs/consensus.md#reserved-namespace-ids>
 
 [nmtlink]: https://github.com/celestiaorg/nmt/blob/master/docs/spec/nmt.md
 [nmtwrapper-link]: https://github.com/celestiaorg/celestia-app/blob/main/pkg/wrapper/nmt_wrapper.go