fix(libraries/rlp): remove duplicate word in writeList NatSpec

[0xAxiom]

RLPWriter.writeList NatSpec (line 21) contains a duplicate word: byte byte strings → byte strings.

The line below the notice (@param _in) already reads byte strings correctly — the typo is in the @notice only.

-    /// @notice RLP encodes a list of RLP encoded byte byte strings.
+    /// @notice RLP encodes a list of RLP encoded byte strings.

String-only edit, no logic changes. GPG-signed.

[cb-heimdall]

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