patch 8.2.2160: various typos

Problem:    Various typos.
Solution:   Fix spelling mistakes. (closes #7494)
diff --git a/src/testdir/test_arglist.vim b/src/testdir/test_arglist.vim
index f45a0d4..d6c369f 100644
--- a/src/testdir/test_arglist.vim
+++ b/src/testdir/test_arglist.vim
@@ -524,7 +524,7 @@
   bwipe Xa.c Xb.c Xc.c
 endfunc
 
-" Test for quiting Vim with unedited files in the argument list
+" Test for quitting Vim with unedited files in the argument list
 func Test_quit_with_arglist()
   CheckRunVimInTerminal
   let buf = RunVimInTerminal('', {'rows': 6})