patch 9.1.0747: various typos in repo found

Problem:  various typos in repo found
Solution: Fix typos (zeertzjq)

closes: #15749

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
index bd83051..32050ce 100644
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -4274,7 +4274,7 @@
 endfunc
 
 " Test for Ctrl-E with long line and very narrow window,
-" used to cause an inifite loop
+" used to cause an infinite loop
 func Test_scroll_longline_no_loop()
   4vnew
   setl smoothscroll number showbreak=> scrolloff=2