patch 8.1.1183: typos in VisVim comments

Problem:    Typos in VisVim comments.
Solution:   Correct the typos. (Christ van Willegen)

src/VisVim/OleAut.cpp

@@ -71,7 +71,7 @@ void COleAutomationControl::DeleteObject ()
 }
 
 // Creates an instance of the Automation object and
-// obtains it's IDispatch interface.
+// obtains its IDispatch interface.
 //
 // Parameters:
 // ProgId	  ProgID of Automation object