docs(catalogs): fix punctuation and spacing

docs/source/library-user-guide/catalogs.md

@@ -34,7 +34,7 @@ DataFusion supports DDL queries (e.g. `CREATE TABLE`) using the catalog API desc
 
 Similarly to other concepts in DataFusion, you'll implement various traits to create your own catalogs, schemas, and tables. The following sections describe the traits you'll need to implement.
 
-The `CatalogProviderList` trait has methods to register new catalogs, get a catalog by name and list all catalogs .The `CatalogProvider` trait has methods to set a schema to a name, get a schema by name, and list all schemas. The `SchemaProvider`, which can be registered with a `CatalogProvider`, has methods to set a table to a name, get a table by name, list all tables, deregister a table, and check for a table's existence. The `TableProvider` trait has methods to scan underlying data and use it in DataFusion. The `TableProvider` trait is covered in more detail [here](./custom-table-providers.md).
+The `CatalogProviderList` trait has methods to register new catalogs, get a catalog by name and list all catalogs. The `CatalogProvider` trait has methods to set a schema to a name, get a schema by name, and list all schemas. The `SchemaProvider`, which can be registered with a `CatalogProvider`, has methods to set a table to a name, get a table by name, list all tables, deregister a table, and check for a table's existence. The `TableProvider` trait has methods to scan underlying data and use it in DataFusion. The `TableProvider` trait is covered in more detail [here](./custom-table-providers.md).
 
 In the following example, we'll implement an in memory catalog, starting with the `SchemaProvider` trait as we need one to register with the `CatalogProvider`. Finally we will implement `CatalogProviderList` to register the `CatalogProvider`.