patch 8.2.4928: various white space and cosmetic mistakes

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.
diff --git a/src/testdir/test_cursorline.vim b/src/testdir/test_cursorline.vim
index e5b2113..96ff300 100644
--- a/src/testdir/test_cursorline.vim
+++ b/src/testdir/test_cursorline.vim
@@ -298,7 +298,7 @@
 
   let lines =<< trim END
       call setline(1, 'aa bb cc dd ee ff gg hh ii jj kk ll mm' ..
-      \ ' nn oo pp qq rr ss tt uu vv ww xx yy zz')
+                    \ ' nn oo pp qq rr ss tt uu vv ww xx yy zz')
       set nowrap
       " The following makes the cursor apparent on the screen dump
       set sidescroll=1 cursorcolumn