doc: typo Synopis

%s/Synopis/Synopsis/g

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/usage/cmd/cbsysinfo.rst b/doc/usage/cmd/cbsysinfo.rst
index 8c03a85..80d8ba1 100644
--- a/doc/usage/cmd/cbsysinfo.rst
+++ b/doc/usage/cmd/cbsysinfo.rst
@@ -3,8 +3,8 @@
 cbsysinfo
 =========
 
-Synopis
--------
+Synopsis
+--------
 
 ::