Like mentioned by Andrei Pavlenko after merging pullrequest #1206, a wrong

ReST directive was used. Also fixed some other ReST directives that were
not correct and removed some warnings during buildbot checks.

modules/stitching/doc/high_level.rst

@@ -88,10 +88,10 @@ High level image stitcher. It's possible to use this class without being aware o
         /* hidden */
     };
 
-.. Sample code::
+.. note::
 
-   * : A basic example on image stitching can be found at opencv_source_code/samples/cpp/stitching.cpp
-   * : A detailed example on image stitching can be found at opencv_source_code/samples/cpp/stitching_detailed.cpp
+   * A basic example on image stitching can be found at opencv_source_code/samples/cpp/stitching.cpp
+   * A detailed example on image stitching can be found at opencv_source_code/samples/cpp/stitching_detailed.cpp
 
 Stitcher::createDefault
 -----------------------