demos/common/python/helpers.py: replace rus C with eng C (#3624)

Author: Wovchena

demos/common/python/helpers.py

@@ -21,9 +21,9 @@ def resolution(value):
     try:
         result = [int(v) for v in value.split('x')]
         if len(result) != 2:
-            raise RuntimeError('Сorrect format of --output_resolution parameter is "width"x"height".')
+            raise RuntimeError('Correct format of --output_resolution parameter is "width"x"height".')
     except ValueError:
-        raise RuntimeError('Сorrect format of --output_resolution parameter is "width"x"height".')
+        raise RuntimeError('Correct format of --output_resolution parameter is "width"x"height".')
     return result
 
 def log_latency_per_stage(*pipeline_metrics):