patch 9.0.0828: various typos

Problem:    Various typos.
Solution:   Correct typos. (closes #11432)
diff --git a/src/bufwrite.c b/src/bufwrite.c
index f3adcc3..18448dc 100644
--- a/src/bufwrite.c
+++ b/src/bufwrite.c
@@ -1475,7 +1475,7 @@
 			{
 			    if (buf_write_bytes(&write_info) == FAIL)
 			    {
-				errmsg = (char_u *)_(e_canot_write_to_backup_file_add_bang_to_override);
+				errmsg = (char_u *)_(e_cant_write_to_backup_file_add_bang_to_override);
 				break;
 			    }
 			    ui_breakcheck();