Docs: Update glance command mapping

Update missing command in glance Mapping Guide.

List of updated command
[Glance CLI / OSC]
md-namespace-create / image metadef namespace create
md-namespace-delete / image metadef namespace delete
md-namespace-list / image metadef namespace list
md-namespace-show / image metadef namespace show

Co-authored-by: sujin01 <a5870771@gmail.com>
Co-authored-by: heesom <heesom.hs@gmail.com>
Co-authored-by: mpicea <jjh77745997@gmail.com>

Change-Id: I4d50b0ae820ea0c8feb1719bbbd9eb06d22cbe20

Author: yerim10044001

doc/source/cli/data/glance.csv

@@ -22,14 +22,14 @@ import-info,,Print import methods available from Glance.
 location-add,,Add a location (and related metadata) to an image.
 location-delete,,Remove locations (and related metadata) from an image.
 location-update,,Update metadata of an image's location.
-md-namespace-create,,Create a new metadata definitions namespace.
-md-namespace-delete,,Delete specified metadata definitions namespace with its contents.
+md-namespace-create,image metadef namespace create,Create a new metadata definitions namespace.
+md-namespace-delete,image metadef namespace delete,Delete specified metadata definitions namespace with its contents.
 md-namespace-import,,Import a metadata definitions namespace from file or standard input.
-md-namespace-list,,List metadata definitions namespaces.
+md-namespace-list,image metadef namespace list,List metadata definitions namespaces.
 md-namespace-objects-delete,,Delete all metadata definitions objects inside a specific namespace.
 md-namespace-properties-delete,,Delete all metadata definitions property inside a specific namespace.
 md-namespace-resource-type-list,,List resource types associated to specific namespace.
-md-namespace-show,,Describe a specific metadata definitions namespace.
+md-namespace-show,image metadef namespace show,Describe a specific metadata definitions namespace.
 md-namespace-tags-delete,,Delete all metadata definitions tags inside a specific namespace.
 md-namespace-update,,Update an existing metadata definitions namespace.
 md-object-create,,Create a new metadata definitions object inside a namespace.