documentation fixes (Bug #1645)

hi there. just some minor typos in the documentation that you may (or may not) like to fix.

http://opencv.itseez.com/doc/tutorials/core/mat-mask-operations/mat-mask-operations.html

"This mask holds values that will just how much influence have neighbor pixel values (and the pixel value itself) to the new pixel value"
-->
"This mask holds values that will adjust how much influence neighboring pixels (and the current pixel) have on the new pixel value"

"sum up the pixel values multiplicity with the overlapped"
-->
"sum up the pixel values multiplied with the overlapped"

"large matrices the later notation is a lot easier to look over"
-->
"large matrices the latter notation is a lot easier to look over"

" with the same size and the same type than our input. As you can see at the "
-->
" with the same size and the same type as our input. As you can see in the "

"simple solution is to do not apply the mask"
-->
"simple solution is to not apply the mask"

"that it’s shorter, more verbose"
-->
"that it’s shorter, less verbose"

"and that because they are some optimization techniques implemented usually faster than the hand method"
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"and because there are some optimization techniques implemented it is usually faster than the hand*-coded* method"

"For example in my while the first one took only 13 milliseconds the second took around 31 milliseconds."
-->
not sure about this.. is it faster or slower?