patch 8.2.3045: minor typos

Problem:    Minor typos.
Solution:   Fix the typos. (Christian Brabandt, closes #8441)
diff --git a/src/VisVim/README_VisVim.txt b/src/VisVim/README_VisVim.txt
index d96becf..f96f102 100644
--- a/src/VisVim/README_VisVim.txt
+++ b/src/VisVim/README_VisVim.txt
@@ -213,7 +213,7 @@
    Cause:	 You can't delete an item you once added to the add-ins
 		 list box.
    Explanation:  M$ just didn't put a 'delete' button in the dialog box.
-		 Unfortunately there is no DEL key accellerator as well...
+		 Unfortunately there is no DEL key accelerator as well...
    Workaround:	 You can't kill it, but you can knock it out:
 		 1. Uncheck the check box in front of 'Vim Developer Studio
 		    Add-in'.