style: fix typo cancelation -> cancellation

Author: TomAFrench

packages/contracts/contracts/NoteStream.sol

@@ -322,7 +322,7 @@ contract NoteStream is Pausable, ReentrancyGuard {
 
         // Check that cancellation transaction is valid and perform transfer
         // i.e. Each party receives a note of correct value
-        StreamUtilities._processCancelation(
+        StreamUtilities._processCancellation(
             aceContractAddress,
             _proof2,
             withdrawalNoteHash,

packages/contracts/contracts/StreamUtilities.sol

@@ -262,7 +262,7 @@ library StreamUtilities {
         return newStreamNote.noteHash;
     }
 
-    function _processCancelation(
+    function _processCancellation(
         address _aceContractAddress,
         bytes memory _proof2,
         bytes32 _withdrawalNoteHash,

packages/contracts/contracts/mocks/StreamUtilitiesMock.sol

@@ -83,15 +83,15 @@ contract StreamUtilitiesMock {
             );
     }
 
-    function processCancelation(
+    function processCancellation(
         address _aceContractAddress,
         bytes memory _proof2,
         bytes32 _proof1OutputNotes,
         Types.AztecStream memory _stream
     ) public returns (bool) {
         stream = _stream;
         return
-            StreamUtilities._processCancelation(
+            StreamUtilities._processCancellation(
                 _aceContractAddress,
                 _proof2,
                 _proof1OutputNotes,

packages/contracts/test/StreamUtilities/processCancellation.js

@@ -76,7 +76,7 @@ describe('StreamUtilities - processCancellation', function () {
         const badProofData = badProof.encodeABI(zkAsset.address);
 
         await expect(
-            streamUtilitiesMock.processCancelation(
+            streamUtilitiesMock.processCancellation(
                 ace.address,
                 badProofData,
                 withdrawalNote.noteHash,
@@ -149,7 +149,7 @@ describe('StreamUtilities - processCancellation', function () {
         const proofData = proof.encodeABI(zkAsset.address);
 
         await expect(
-            streamUtilitiesMock.processCancelation(
+            streamUtilitiesMock.processCancellation(
                 ace.address,
                 proofData,
                 withdrawalNote.noteHash,