doc: typo Synopis

%s/Synopis/Synopsis/g

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/usage/cmd/for.rst b/doc/usage/cmd/for.rst
index 4c98419..729bd4d 100644
--- a/doc/usage/cmd/for.rst
+++ b/doc/usage/cmd/for.rst
@@ -4,8 +4,8 @@
 for command
 ===========
 
-Synopis
--------
+Synopsis
+--------
 
 ::