patch 9.0.0963: function name does not match autocmd event name

Problem:    Function name does not match autocmd event name.
Solution:   Rename "optionsset" to "optionset". (closes #11630)
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index bcaef5d..e82e647 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -3394,7 +3394,7 @@
 endfunc
 
 func Test_cclose_in_autocmd()
-  " Problem is only triggered if "starting" is zero, so that the OptionsSet
+  " Problem is only triggered if "starting" is zero, so that the OptionSet
   " event will be triggered.
   call test_override('starting', 1)
   augroup QF_Test