patch 9.0.1886: Various Typos

Problem:  Various Typos
Solution: Fix Typos

This is a collection of typo related commits.

closes: #12753
closes: #13016

Co-authored-by: Adri Verhoef <a3@a3.xs4all.nl>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Co-authored-by: Viktor Szépe <viktor@szepe.net>
Co-authored-by: nuid64 <lvkuzvesov@proton.me>
Co-authored-by: Meng Xiangzhuo <aumo@foxmail.com>
Co-authored-by: Dominique Pellé <dominique.pelle@gmail.com>

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_mksession.vim b/src/testdir/test_mksession.vim
index 5485e14..78d301f 100644
--- a/src/testdir/test_mksession.vim
+++ b/src/testdir/test_mksession.vim
@@ -568,7 +568,7 @@
 func Test_mkview_terminal_windows()
   CheckFeature terminal
 
-  " create two window on the same terminal to check this is handled OK
+  " create two windows on the same terminal to check this is handled OK
   terminal
   let term_buf = bufnr()
   exe 'sbuf ' .. term_buf