patch 9.1.0220: Few typos in source and test files

Problem:  Typos in code and tests.
Solution: Fix typos (zeertzjq).

closes: #14321

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
index fd174a9..adcc3e9 100644
--- a/src/testdir/test_visual.vim
+++ b/src/testdir/test_visual.vim
@@ -1149,7 +1149,7 @@
   " try to select non-existing inner block
   call cursor(5, 1)
   call assert_beeps('normal ViBiBiB')
-  " try to select a unclosed inner block
+  " try to select an unclosed inner block
   8,9d
   call cursor(5, 1)
   call assert_beeps('normal ViBiB')