patch 9.0.0118: no test for what patch 9.0.0155 fixes

Problem:    No test for what patch 9.0.0155 fixes.
Solution:   Add a test. Fix typos.  (closes #10822)
diff --git a/src/register.c b/src/register.c
index 7906d92..55787df 100644
--- a/src/register.c
+++ b/src/register.c
@@ -389,7 +389,7 @@
 
 	    if (p_ch < 1)
 	    {
-		// Enable macro indicator temporary
+		// Enable macro indicator temporarily
 		set_option_value((char_u *)"ch", 1L, NULL, 0);
 		update_screen(VALID);