Enhance IERC6372 NatSpec following the ERC definitions

contracts/interfaces/IERC6372.sol

@@ -3,16 +3,26 @@
 
 pragma solidity >=0.4.16;
 
+/**
+ * @dev Interface for the Contract Clock standard.
+ *
+ * A standardized interface for a contract to expose the clock it uses internally, so that an external observer can
+ * tell whether it tracks time using timestamps, block numbers, or some other mode, instead of assuming one.
+ */
 interface IERC6372 {
     /**
-     * @dev Clock used for flagging checkpoints. Can be overridden to implement timestamp based checkpoints (and voting).
+     * @dev Returns the current timepoint according to the mode the contract is operating on.
+     * This is a non-decreasing function of the chain, such as `block.timestamp` or `block.number`.
      *
      * NOTE: Clock must not return 0.
      */
     function clock() external view returns (uint48);
 
     /**
-     * @dev Description of the clock
+     * @dev Returns a machine-readable description of the clock, formatted as a URL query string.
+     * Timestamps are described as `mode=timestamp` and block numbers as `mode=blocknumber&from=default`,
+     * where `default` becomes a CAIP-2 chain ID (e.g. `eip155:1`) if the block number is not that of the
+     * `NUMBER` opcode (0x43). Any other mode uses a unique identifier for the `mode` field.
      */
     // solhint-disable-next-line func-name-mixedcase
     function CLOCK_MODE() external view returns (string memory);