docs: standardize positions and observations functions documentation

[Caplost]

Description

Standardize the documentation format for positions() and observations() functions in IUniswapV3PoolState.sol. This change focuses on improving clarity and maintaining consistency with Solidity documentation best practices.

Changes

• Standardize return value documentation with proper @return tags
• Remove redundant commas and "Returns" prefixes
• Simplify descriptions while maintaining technical accuracy
• Make documentation more concise and direct

Technical Details

The changes maintain all the important technical information while presenting it in a more standardized format:

• For positions(): Clearly document the position key structure and return values
• For observations(): Improve clarity of observation data structure documentation

Before and After Comparison

positions() Before:

// Returns liquidity The amount of liquidity in the position,
/// Returns feeGrowthInside0LastX128 fee growth of token0 inside the tick range as of the last mint/burn/poke,
/// Returns feeGrowthInside1LastX128 fee growth of token1 inside the tick range as of the last mint/burn/poke,

positions() After:

/// @return liquidity The amount of liquidity in the position
/// @return feeGrowthInside0LastX128 Fee growth of token0 inside the tick range as of the last mint/burn/poke
/// @return feeGrowthInside1LastX128 Fee growth of token1 inside the tick range as of the last mint/burn/poke

observations() Before:

/// @return blockTimestamp The timestamp of the observation,
/// Returns tickCumulative the tick multiplied by seconds elapsed for the life of the pool as of the observation timestamp,
/// Returns secondsPerLiquidityCumulativeX128 the seconds per in range liquidity for the life of the pool as of the observation timestamp,

observations() After:

/// @return blockTimestamp The timestamp of the observation
/// @return tickCumulative The tick multiplied by seconds elapsed for the life of the pool as of the observation timestamp
/// @return secondsPerLiquidityCumulativeX128 The seconds per in range liquidity for the life of the pool as of the observation timestamp

Type of change

Documentation update (non-breaking change)

Checklist

• Documentation update only
• No code changes
• No breaking changes
• Improves documentation consistency
• Maintains all technical details

[l14zj]

‏_xcciu