docs: improve slot0 function return value documentation

- Format each return value with proper @return tag
- Improve readability of slot0 function documentation
- Keep detailed descriptions while maintaining consistent format

contracts/interfaces/pool/IUniswapV3PoolState.sol

@@ -8,16 +8,16 @@ interface IUniswapV3PoolState {
     /// @notice The 0th storage slot in the pool stores many values, and is exposed as a single method to save gas
     /// when accessed externally.
     /// @return sqrtPriceX96 The current price of the pool as a sqrt(token1/token0) Q64.96 value
-    /// tick The current tick of the pool, i.e. according to the last tick transition that was run.
+    /// @return tick The current tick of the pool, i.e. according to the last tick transition that was run.
     /// This value may not always be equal to SqrtTickMath.getTickAtSqrtRatio(sqrtPriceX96) if the price is on a tick
     /// boundary.
-    /// observationIndex The index of the last oracle observation that was written,
-    /// observationCardinality The current maximum number of observations stored in the pool,
-    /// observationCardinalityNext The next maximum number of observations, to be updated when the observation.
-    /// feeProtocol The protocol fee for both tokens of the pool.
-    /// Encoded as two 4 bit values, where the protocol fee of token1 is shifted 4 bits and the protocol fee of token0
-    /// is the lower 4 bits. Used as the denominator of a fraction of the swap fee, e.g. 4 means 1/4th of the swap fee.
-    /// unlocked Whether the pool is currently locked to reentrancy
+    /// @return observationIndex The index of the last oracle observation that was written
+    /// @return observationCardinality The current maximum number of observations stored in the pool
+    /// @return observationCardinalityNext The next maximum number of observations, to be updated when the observation
+    /// @return feeProtocol The protocol fee for both tokens of the pool. Encoded as two 4 bit values, where the protocol fee of token1 
+    /// is shifted 4 bits and the protocol fee of token0 is the lower 4 bits. Used as the denominator of a fraction of the swap fee, 
+    /// e.g. 4 means 1/4th of the swap fee.
+    /// @return unlocked Whether the pool is currently locked to reentrancy
     function slot0()
         external
         view