CR: comments and code clarity

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -1902,7 +1902,7 @@ typedef enum : NSUInteger {
                                    // as-of-yet-undecrypted messages
                                    if ([errorMessage isKindOfClass:[TSInvalidIdentityKeyReceivingErrorMessage class]]) {
                                        // Deliberately crash if the user fails to explicitly accept the new identity
-                                       // key. In practice we haven't been creating these messags in over a year.
+                                       // key. In practice we haven't been creating these messages in over a year.
                                        [errorMessage throws_acceptNewIdentityKey];
                                    }
                                }];

SignalServiceKit/src/Account/TSAccountManager.m

@@ -159,7 +159,7 @@ NSString *const TSAccountManager_NeedsAccountAttributesUpdateKey = @"TSAccountMa
     NSString *phoneNumber = self.phoneNumberAwaitingVerification;
 
     if (!phoneNumber) {
-        OWSFail(@"phonNumber was unexpectedly nil");
+        OWSFail(@"phoneNumber was unexpectedly nil");
     }
 
     [self storeLocalNumber:phoneNumber];

SignalServiceKit/src/Messages/OWSMessageSender.m

@@ -1609,7 +1609,6 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
             }) retainUntilComplete];
 }
 
-// NOTE: This method uses exceptions for control flow.
 - (NSDictionary *)throws_encryptedMessageForMessageSend:(OWSMessageSend *)messageSend
                                                deviceId:(NSNumber *)deviceId
                                               plainText:(NSData *)plainText

SignalServiceKit/src/Storage/AxolotlStore/OWSPrimaryStorage+SignedPreKeyStore.m

@@ -30,14 +30,15 @@ NSString *const OWSPrimaryStorageKeyPrekeyCurrentSignedPrekeyId = @"currentSigne
     int preKeyId = 1 + arc4random_uniform(INT32_MAX - 1);
     ECKeyPair *_Nullable identityKeyPair = [[OWSIdentityManager sharedManager] identityKeyPair];
     OWSAssert(identityKeyPair);
+
     @try {
-        return [[SignedPreKeyRecord alloc]
-             initWithId:preKeyId
-                keyPair:keyPair
-              signature:[Ed25519 throws_sign:keyPair.publicKey.prependKeyType withKeyPair:identityKeyPair]
-            generatedAt:[NSDate date]];
+        NSData *signature = [Ed25519 throws_sign:keyPair.publicKey.prependKeyType withKeyPair:identityKeyPair];
+        return [[SignedPreKeyRecord alloc] initWithId:preKeyId
+                                              keyPair:keyPair
+                                            signature:signature
+                                          generatedAt:[NSDate date]];
     } @catch (NSException *exception) {
-        // throws_sign only throws when the data to sign is empty or `keyPair`.
+        // throws_sign only throws when the data to sign is empty or `keyPair` is nil.
         // Neither of which should happen.
         OWSFail(@"exception: %@", exception);
         return nil;