Edited some comments

Updated some mutable object instantiations

CountlyConnectionManager.m

@@ -279,7 +279,7 @@ - (void)sendCrashReport:(NSString *)report immediately:(BOOL)immediately;
         return;
     }
 
-    //NOTE: to prevent `event` and `end_session` requests from being added to queue and started, after `sendEvents` and `endSession` calls below.
+    //NOTE: to prevent `event` and `end_session` requests from being started, after `sendEvents` and `endSession` calls below.
     isCrashing = YES;
 
     [self sendEvents];
@@ -404,7 +404,7 @@ - (NSString *)queryEssentials
 
 - (NSString *)additionalInfo
 {
-    NSMutableString *additionalInfo = @"".mutableCopy;
+    NSMutableString *additionalInfo = NSMutableString.new;
 
     if (CountlyCommon.sharedInstance.ISOCountryCode)
         [additionalInfo appendFormat:@"&%@=%@", kCountlyQSKeyCountryCode, CountlyCommon.sharedInstance.ISOCountryCode.cly_URLEscaped];

CountlyCrashReporter.m

@@ -168,8 +168,7 @@ void CountlySignalHandler(int signalCode)
 
     free(lines);
 
-    NSMutableDictionary *userInfo = @{kCountlyCRKeySignalCode:@(signalCode)}.mutableCopy;
-    userInfo[kCountlyExceptionUserInfoBacktraceKey] = backtrace;
+    NSDictionary *userInfo = @{kCountlyCRKeySignalCode: @(signalCode), kCountlyExceptionUserInfoBacktraceKey: backtrace};
     NSString *reason = [NSString stringWithFormat:@"App terminated by SIG%@", [NSString stringWithUTF8String:sys_signame[signalCode]].uppercaseString];
     NSException *e = [NSException exceptionWithName:@"Fatal Signal" reason:reason userInfo:userInfo];