Merge pull request opencv#10469 from victor-ludorum:stichingbranch

Updating stiching.cpp to resolve new line issue opencv#10461 (opencv#10469)

Author: victor-ludorum

samples/cpp/stitching.cpp

@@ -44,7 +44,7 @@ void printUsage(char** argv)
          "Images stitcher.\n\n" << "Usage :\n" << argv[0] <<" [Flags] img1 img2 [...imgN]\n\n"
          "Flags:\n"
          "  --d3\n"
-         "      internally creates three chunks of each image to increase stitching success"
+         "      internally creates three chunks of each image to increase stitching success\n"
          "  --try_use_gpu (yes|no)\n"
          "      Try to use GPU. The default value is 'no'. All default values\n"
          "      are for CPU mode.\n"
@@ -54,7 +54,7 @@ void printUsage(char** argv)
          "      for stitching materials under affine transformation, such as scans.\n"
          "  --output <result_img>\n"
          "      The default is 'result.jpg'.\n\n"
-         "Example usage :\n" << argv[0] << " --d3 --try_use_gpu yes --mode scans img1.jpg img2.jpg";
+         "Example usage :\n" << argv[0] << " --d3 --try_use_gpu yes --mode scans img1.jpg img2.jpg\n";
 }