patch 8.2.4611: typos in tests; one lua line not covered by test

Problem:    Typos in tests; one lua line not covered by test.
Solution:   Fix typos. Add test case. (Dominique Pellé, closes #9994)
diff --git a/src/testdir/test_cursorline.vim b/src/testdir/test_cursorline.vim
index 2b29007..c2505e3 100644
--- a/src/testdir/test_cursorline.vim
+++ b/src/testdir/test_cursorline.vim
@@ -162,7 +162,7 @@
   call term_sendkeys(buf, "gj")
   call VerifyScreenDump(buf, 'Test_'. filename. '_12', {})
   if exists("+foldcolumn") && exists("+signcolumn") && exists("+breakindent")
-    " test with set foldcolumn signcoloumn and breakindent
+    " test with set foldcolumn signcolumn and breakindent
     call term_sendkeys(buf, "gg0")
     call term_sendkeys(buf, ":set breakindent foldcolumn=2 signcolumn=yes\<cr>")
     call VerifyScreenDump(buf, 'Test_'. filename. '_13', {})