Merge pull request #8253 from adl1995:master

* Update linux_install.markdown

Grammar improvements, fixed typos.

* Update tutorials.markdown

Improvements in grammar.

* Update table_of_content_calib3d.markdown

* Update camera_calibration_square_chess.markdown

Improvements in grammar. Added answer.

* Update tutorials.markdown

* Update erosion_dilatation.markdown

* Update table_of_content_imgproc.markdown

* Update warp_affine.markdown

* Update camera_calibration_square_chess.markdown

Removed extra space.

* Update gpu_basics_similarity.markdown

Grammatical improvements, fixed typos.

* Update trackbar.markdown

Improvement for better understanding.

doc/tutorials/tutorials.markdown

@@ -2,7 +2,7 @@ OpenCV Tutorials {#tutorial_root}
 ================
 
 The following links describe a set of basic OpenCV tutorials. All the source code mentioned here is
-provided as part of the OpenCV regular releases, so check before you start copy & pasting the code.
+provided as part of the OpenCV regular releases, so check before you start copying & pasting the code.
 The list of tutorials below is automatically generated from reST files located in our GIT
 repository.
 
@@ -10,12 +10,12 @@ As always, we would be happy to hear your comments and receive your contribution
 
 -   @subpage tutorial_table_of_content_introduction
 
-    You will learn how to setup OpenCV on your computer!
+    You will learn how to setup OpenCV on your computer
 
 -   @subpage tutorial_table_of_content_core
 
     Here you will learn
-    the about the basic building blocks of the library. A must read and know for understanding how
+    the about the basic building blocks of this library. A must read for understanding how
     to manipulate the images on a pixel level.
 
 -   @subpage tutorial_table_of_content_imgproc
@@ -25,7 +25,7 @@ As always, we would be happy to hear your comments and receive your contribution
 
 -   @subpage tutorial_table_of_content_highgui
 
-    This section contains valuable tutorials about how to use the
+    This section contains valuable tutorials on how to use the
     built-in graphical user interface of the library.
 
 -   @subpage tutorial_table_of_content_imgcodecs
@@ -38,9 +38,9 @@ As always, we would be happy to hear your comments and receive your contribution
 
 -   @subpage tutorial_table_of_content_calib3d
 
-    Although we got
-    most of our images in a 2D format they do come from a 3D world. Here you will learn how to find
-    out from the 2D images information about the 3D world.
+    Although
+    most of our images are in a 2D format they do come from a 3D world. Here you will learn how to find
+    out 3D world information from 2D images.
 
 -   @subpage tutorial_table_of_content_features2d
 
@@ -49,14 +49,14 @@ As always, we would be happy to hear your comments and receive your contribution
 
 -   @subpage tutorial_table_of_content_video
 
-    Look here in order
-    to find algorithms usable on your video streams like: motion extraction, feature tracking and
+    Here you will find
+    algorithms usable on your video streams like motion extraction, feature tracking and
     foreground extractions.
 
 -   @subpage tutorial_table_of_content_objdetect
 
     Ever wondered
-    how your digital camera detects peoples and faces? Look here to find out!
+    how your digital camera detects people's faces? Look here to find out!
 
 -   @subpage tutorial_table_of_content_ml
 
@@ -75,7 +75,7 @@ As always, we would be happy to hear your comments and receive your contribution
 -   @subpage tutorial_table_of_content_gpu
 
     Squeeze out every
-    little computation power from your system by using the power of your video card to run the
+    little computational power from your system by utilizing the power of your video card to run the
     OpenCV algorithms.
 
 -   @subpage tutorial_table_of_content_ios