Remove implementation detail

EIPS/eip-5615.md

@@ -27,7 +27,7 @@ interface ERC1155Supply is ERC1155 {
   function exists(uint256 id) external view returns (bool);
 
   // @notice      If the given id exists, previously existed, or may exist, this function MUST return the number of tokens with a given id. Otherwise, this function MUST revert.
-  // @dev         This MUST revert if exists(id) returns false. This function therefore MUST call the exists function.
+  // @dev         This MUST revert if exists(id) returns false
   // @param   id  The token id of which fetch the total supply
   // @return      The total supply of the given token id
   function totalSupply(uint256 id) external view returns (uint256);
@@ -38,8 +38,6 @@ interface ERC1155Supply is ERC1155 {
 
 This EIP does not implement [EIP-165](./eip-165.md), as this interface is simple enough that the extra complexity is unnecessary and would cause incompatibilities with pre-existing implementations.
 
-For extensibility, `totalSupply` is required to call the `exists` function in case a contract extends the base implementation and overrides `exists`.
-
 ## Backwards Compatibility
 
 This EIP is designed to be backward compatible with the OpenZeppelin `ERC1155Supply`.