patch 9.1.0379: There are a few typos

Problem:  There are a few typos
Solution: Fix them (zeertzjq)

closes: #14655

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_textformat.vim b/src/testdir/test_textformat.vim
index 5d58486..e31ea22 100644
--- a/src/testdir/test_textformat.vim
+++ b/src/testdir/test_textformat.vim
@@ -1304,7 +1304,7 @@
 endfunc
 
 " This was crashing Vim
-func Test_textwdith_overflow()
+func Test_textwidth_overflow()
   new
   setl tw=999999999
   normal 10ig