patch 8.2.2160: various typos

Problem:    Various typos.
Solution:   Fix spelling mistakes. (closes #7494)
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index a36e0f5..b8641fe 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -3308,7 +3308,7 @@
   call term_sendkeys(buf, "cc\<C-X>\<C-U>")
   call VerifyScreenDump(buf, 'Test_popupwin_infopopup_6', {})
 
-  " Hide the info popup, cycle trough buffers, make sure it didn't get
+  " Hide the info popup, cycle through buffers, make sure it didn't get
   " deleted.
   call term_sendkeys(buf, "\<Esc>")
   call term_sendkeys(buf, ":set hidden\<CR>")