docs: minor improvements

src/ChainlinkOracle.sol

@@ -56,7 +56,7 @@ contract ChainlinkOracle is IOracle {
         // The vault parameter is used for ERC4626 tokens, to price its shares.
         // It is used to price `VAULT_CONVERSION_SAMPLE` of the vault shares, so it requires dividing by that number,
         // hence the division by `VAULT_CONVERSION_SAMPLE` in the `SCALE_FACTOR` definition.
-        // Verify that vault = 0 => vaultConversionSample = 1.
+        // Verify that vault = address(0) => vaultConversionSample = 1.
         require(
             address(vault) != address(0) || vaultConversionSample == 1, ErrorsLib.VAULT_CONVERSION_SAMPLE_IS_NOT_ONE
         );

src/libraries/ErrorsLib.sol

@@ -9,6 +9,6 @@ library ErrorsLib {
     /// @notice Thrown when the answer returned by a Chainlink feed is negative.
     string constant NEGATIVE_ANSWER = "negative answer";
 
-    /// @notice Thrown when the vault conversion sample is not 1 while vault = 0.
+    /// @notice Thrown when the vault conversion sample is not 1 while vault = address(0).
     string constant VAULT_CONVERSION_SAMPLE_IS_NOT_ONE = "vault conversion sample is not one";
 }