doc/source/commands.rst: Fix reference to workspace_open

doc/source/commands.rst

diff --git a/doc/source/commands.rst b/doc/source/commands.rst
index 18affc6..6366cd7 100644
--- a/doc/source/commands.rst
+++ b/doc/source/commands.rst
@@ -102,7 +102,7 @@
 
 .. _invoking_workspace_open:
 
-.. click:: buildstream._frontend.cli:workspace_open
+.. click:: buildstream._frontend.cli:workspace_open_base
    :prog: bst workspace open
 
 ----