fix: store configs

# What does this PR do?


## Test Plan

docs/source/providers/agents/inline_meta-reference.md

@@ -16,7 +16,6 @@ Meta's reference implementation of an agent system that can use tools, access ve
 ```yaml
 persistence_store:
   type: sqlite
-  namespace: null
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/dummy}/agents_store.db
 responses_store:
   type: sqlite

docs/source/providers/datasetio/inline_localfs.md

@@ -15,7 +15,6 @@ Local filesystem-based dataset I/O provider for reading and writing datasets to
 ```yaml
 kvstore:
   type: sqlite
-  namespace: null
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/dummy}/localfs_datasetio.db
 
 ```

docs/source/providers/datasetio/remote_huggingface.md

@@ -15,7 +15,6 @@ HuggingFace datasets provider for accessing and managing datasets from the Huggi
 ```yaml
 kvstore:
   type: sqlite
-  namespace: null
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/dummy}/huggingface_datasetio.db
 
 ```

docs/source/providers/eval/inline_meta-reference.md

@@ -15,7 +15,6 @@ Meta's reference implementation of evaluation tasks with support for multiple la
 ```yaml
 kvstore:
   type: sqlite
-  namespace: null
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/dummy}/meta_reference_eval.db
 
 ```

docs/source/providers/vector_io/inline_faiss.md

@@ -44,7 +44,6 @@ more details about Faiss in general.
 ```yaml
 kvstore:
   type: sqlite
-  namespace: null
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/dummy}/faiss_store.db
 
 ```

docs/source/providers/vector_io/inline_meta-reference.md

@@ -15,7 +15,6 @@ Meta's reference implementation of a vector database.
 ```yaml
 kvstore:
   type: sqlite
-  namespace: null
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/dummy}/faiss_store.db
 
 ```

docs/source/providers/vector_io/inline_milvus.md

@@ -19,7 +19,6 @@ Please refer to the remote provider documentation.
 db_path: ${env.MILVUS_DB_PATH:=~/.llama/dummy}/milvus.db
 kvstore:
   type: sqlite
-  namespace: null
   db_path: ${env.SQLITE_STORE_DIR:=~/.llama/dummy}/milvus_registry.db
 
 ```