fixing grammar

examples/matrix_ex.cpp

@@ -34,7 +34,7 @@ int main()
 
     // First let's declare these 3 matrices.
     // This declares a matrix that contains doubles and has 3 rows and 1 column.
-    // Moreover, it's size is a compile time constant since we put it inside the <>.
+    // Moreover, its size is a compile time constant since we put it inside the <>.
     matrix<double,3,1> y;
     // Make a 3 by 3 matrix of doubles for the M matrix.  In this case, M is
     // sized at runtime and can therefore be resized later by calling M.set_size(). 
@@ -170,7 +170,7 @@ int main()
     // MATLAB: E = A * B
     E = A*B;
 
-    // MATLAB: E = A + B
+    // MATLAB: E = A + C
     E = A + C;
 
     // MATLAB: E = A + 5

examples/matrix_expressions_ex.cpp

@@ -247,7 +247,7 @@ struct example_op_vector_to_matrix
     /*!
         This object defines a matrix expression that holds a reference to a std::vector<T>
         and makes it look like a column vector.  Thus it enables you to use a std::vector
-        as if it was a dlib::matrix.
+        as if it were a dlib::matrix.
 
     !*/
     example_op_vector_to_matrix( const std::vector<T>& vect_) : vect(vect_){}