doc: netlink: Change generated docs to limit TOC to depth 3

The tables of contents in the generated Netlink docs include individual
attribute definitions. This can make the contents exceedingly long and
repeats a lot of what is on the rest of the pages. See for example:

https://docs.kernel.org/networking/netlink_spec/tc.html

Add a depth limit to the contents directive in generated .rst files to
limit the contents depth to 3 levels. This reduces the contents to:

 - Family
   - Summary
   - Operations
     - op-one
     - op-two
     - ...
   - Definitions
     - struct-one
     - struct-two
     - enum-one
     - ...
   - Attribute sets
     - attrs-one
     - attrs-two
     - ...
Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Breno Leitao <leitao@debian.org>
Link: https://lore.kernel.org/r/20240329135021.52534-2-donald.hunter@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/ynl-gen-rst.py

@@ -291,7 +291,7 @@ def parse_yaml(obj: Dict[str, Any]) -> str:
 
     title = f"Family ``{obj['name']}`` netlink specification"
     lines.append(rst_title(title))
-    lines.append(rst_paragraph(".. contents::\n"))
+    lines.append(rst_paragraph(".. contents:: :depth: 3\n"))
 
     if "doc" in obj:
         lines.append(rst_subtitle("Summary"))