fix(OracleLibrary): add missing @return for liquidity in getBlockStartingTickAndLiquidity NatSpec

[0xAxiom]

Summary

getBlockStartingTickAndLiquidity returns two values — (int24 tick, uint128 liquidity) — but only the first return value had a NatSpec @return annotation. The @notice also described only the tick, omitting liquidity.

Before:

/// @notice Given a pool, it returns the tick value as of the start of the current block
/// @param pool Address of Uniswap V3 pool
/// @return The tick that the pool was in at the start of the current block
function getBlockStartingTickAndLiquidity(address pool) internal view returns (int24, uint128) {

After:

/// @notice Given a pool, it returns the tick value and liquidity as of the start of the current block
/// @param pool Address of Uniswap V3 pool
/// @return The tick that the pool was in at the start of the current block
/// @return The liquidity of the pool as of the start of the current block
function getBlockStartingTickAndLiquidity(address pool) internal view returns (int24, uint128) {

This mirrors the existing pattern in consult, which properly documents both of its return values with separate @return tags.

Changes

• contracts/libraries/OracleLibrary.sol: added missing @return for liquidity; expanded @notice to mention both outputs

No logic changes.