fixed more doc builder warnings

modules/features2d/doc/common_interfaces_of_descriptor_extractors.rst

@@ -85,5 +85,4 @@ Creates a descriptor extractor by name.
 The current implementation supports the following types of a descriptor extractor:
 
  * ``"BRISK"`` -- :ocv:class:`BRISK`
- * ``"ORB"`` -- :ocv:class:`ORB`
- 
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+ * ``"ORB"`` -- :ocv:class:`ORB`
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modules/features2d/doc/feature_detection_and_description.rst

@@ -249,6 +249,4 @@ SIFT
 
 .. ocv:class:: SIFT : public Feature2D
 
-The SIFT algorithm has been moved to opencv_contrib/xfeatures2d module.
-
-
+The SIFT algorithm has been moved to opencv_contrib/xfeatures2d module.
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