DOC: fix a few typos in the documentation
This commit deals with a few misspells in the documentation.
diff --git a/doc/close-options.txt b/doc/close-options.txt
index 7790937..5f1c9d9 100644
--- a/doc/close-options.txt
+++ b/doc/close-options.txt
@@ -10,7 +10,7 @@
Options can be split between frontend and backend, so some of them might have
a meaning only when combined by associating a frontend to a backend. Some forms
are not the normal ones and provide a behaviour compatible with another normal
-form. Those are considered alternate forms and are markes "(alt)".
+form. Those are considered alternate forms and are marked "(alt)".
FC SC HC PK Behaviour
0 0 0 X tunnel mode