[PATCH v3] docs: Fix kernel-doc error in CAN driver

[Luis Felipe Hernandez <luis.hernandez093@gmail.com>]

Fix kernel-doc formatting issue causing unexpected indentation error
in ctucanfd driver documentation build. Convert main return values
to bullet list format while preserving numbered sub-list in order to
correct indentation error and visual structure in rendered html.

Signed-off-by: Luis Felipe Hernandez <luis.hernandez093@gmail.com>

---
Changes since v2:
- Focus only on CAN driver (GPU and I3C already fixed by Bagas Sanjaya)
- Remove blank line that caused unwanted 'Description' output
- Keep numbered sub-list format as suggested by Randy Dunlap
- Move changelog after cutter as suggested by Vincent Mailhol

Link(v2): https://lore.kernel.org/all/20250720152401.70720-1-luis.hernandez093@gmail.com/
Link(v1): https://lore.kernel.org/all/20250703023511.82768-1-luis.hernandez093@gmail.com/
---
 drivers/net/can/ctucanfd/ctucanfd_base.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/ctucanfd/ctucanfd_base.c b/drivers/net/can/ctucanfd/ctucanfd_base.c
index bf6398772960..8bd3f0fc385c 100644
--- a/drivers/net/can/ctucanfd/ctucanfd_base.c
+++ b/drivers/net/can/ctucanfd/ctucanfd_base.c
@@ -506,11 +506,12 @@ static bool ctucan_is_txt_buf_writable(struct ctucan_priv *priv, u8 buf)
  * @buf:	TXT Buffer index to which frame is inserted (0-based)
  * @isfdf:	True - CAN FD Frame, False - CAN 2.0 Frame
  *
- * Return: True - Frame inserted successfully
- *	   False - Frame was not inserted due to one of:
- *			1. TXT Buffer is not writable (it is in wrong state)
- *			2. Invalid TXT buffer index
- *			3. Invalid frame length
+ * Return:
+ * * True - Frame inserted successfully
+ * * False - Frame was not inserted due to one of:
+ *	1. TXT Buffer is not writable (it is in wrong state)
+ *	2. Invalid TXT buffer index
+ *	3. Invalid frame length
  */
 static bool ctucan_insert_frame(struct ctucan_priv *priv, const struct canfd_frame *cf, u8 buf,
 				bool isfdf)
-- 
2.43.0