Fix Typographical Errors in SHA384.sol and RegistrationSimple.test.ts (#33)

* Update RegistrationSimple.test.ts

* Update SHA384.sol

Author: leopardracer

contracts/utils/SHA384.sol

@@ -318,7 +318,7 @@ library LibBytes {
                     let first := mload(source)
 
                     // Copy whole words back to front
-                    // We use a signed comparisson here to allow dEnd to become
+                    // We use a signed comparison here to allow dEnd to become
                     // negative (happens when source and dest < 32). Valid
                     // addresses in local memory will never be larger than
                     // 2**255, so they can be safely re-interpreted as signed.

test/registration/RegistrationSimple.test.ts

@@ -263,7 +263,7 @@ describe("RegistrationSimple", () => {
       );
     });
 
-    it("should revert if non-exising operation ID was provided", async () => {
+    it("should revert if non-existing operation ID was provided", async () => {
       const encoder = new ethers.AbiCoder();
       const data = encoder.encode(["address[]", "uint8[]"], [[FIRST.address], [12 as RegistrationSimpleOperationId]]);