Improve SEO metadata across documentation pages (#4447)

docs/api-reference/entities/delete-user.mdx

@@ -1,4 +1,5 @@
 ---
 title: 'Delete User'
+description: "Remove a user entity from the Mem0 platform by entity type and ID using the DELETE endpoint."
 openapi: delete /v2/entities/{entity_type}/{entity_id}/
 ---

docs/api-reference/entities/get-users.mdx

@@ -1,4 +1,5 @@
 ---
 title: 'Get Users'
+description: "Retrieve a list of all user entities stored in the Mem0 platform using the GET endpoint."
 openapi: get /v1/entities/
 ---