fix: couple of typos (#5833)

Author: CreeptoGengar

contracts/utils/Base64.sol

@@ -34,7 +34,7 @@ library Base64 {
      */
     function _encode(bytes memory data, string memory table, bool withPadding) private pure returns (string memory) {
         /**
-         * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence
+         * Inspired by Brecht Devos (Brechtpd) implementation - MIT license
          * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol
          */
         if (data.length == 0) return "";