netlink: specs: fix a couple of yamllint warnings

Clean up the remaining yamllint warnings in the netlink specs:

    [warning] comment not indented like content (comments-indentation)
    [error] too many spaces after colon (colons)

Signed-off-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> # mptcp_pm.yaml
Link: https://patch.msgid.link/20250610125944.85265-8-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/netlink/specs/devlink.yaml

@@ -1139,7 +1139,7 @@ attribute-sets:
       -
         name: param-type
 
-      # TODO: fill in the attribute param-value-list
+        # TODO: fill in the attribute param-value-list
 
   -
     name: dl-region-snapshots
@@ -1266,7 +1266,7 @@ operations:
           attributes: &dev-id-attrs
             - bus-name
             - dev-name
-        reply:  &get-reply
+        reply: &get-reply
           value: 3
           attributes:
             - bus-name