modify formhandler doc

docs/formhandler.md

@@ -22,10 +22,12 @@ The full list of options is below. Simple options can be specified as `data-` at
 
 - `src`: [FormHandler][formhandler] URL endpoint
 - `data`: Array of objects. Dataset for formhandler table. If both `src` and `data` are provided, `data` takes priority.
-- `namespace`: (Optional) If `namespace` specified, the URL will append as `?namespace:key=value`.
-  When using multiple tables namespace must be specified.
-  `key=value` only applies to formhandlers with namespace as `name`.
-  Filters without a namespace like `?key=value` will apply to all formhandlers.
+- `namespace`:
+    - (Optional) If `namespace` specified, the URL will append as `?name:key=value`.
+    - If the URL has `name:key=value`, the filter only applies to formhandlers with namespace as `name`.
+    - Filters without a namespace like `?key=value` will apply to all formhandlers.
+    - When using multiple tables use of `namespace` is necessary .
+
 - `columns`: comma-separated column names to display, or a list of objects with these keys:
     - `name`: column name. `"*"` is a special column placeholder for "all columns" (options given for `"*"` are applied for all columns)
     - `title`: for header display. Defaults to the same value as `name`