patch 9.1.0157: Duplicate assignment in f_getregion()

Problem:  Duplicate assignment in f_getregion().
Solution: Remove the duplicate assignment.  Also improve getregion()
          docs wording and fix an unrelated typo (zeertzjq)

closes: #14154

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_undo.vim b/src/testdir/test_undo.vim
index 13c4990..eec0e0b 100644
--- a/src/testdir/test_undo.vim
+++ b/src/testdir/test_undo.vim
@@ -583,7 +583,7 @@
   endif
   call assert_equal('', undofile(''))
 
-  " Test undofile() with 'undodir' set to to an existing directory.
+  " Test undofile() with 'undodir' set to an existing directory.
   call mkdir('Xundodir')
   set undodir=Xundodir
   let cwd = getcwd()