Documentation: hid-alps: Fix packet format section headings

In "Packet Format" section, only "StickPointer data byte" subsection
heading is shown as such in htmldocs output; "Touchpad data byte" one
is in normal paragraph on the other hand.

Properly format the headings to be consistent.

Fixes: 2562756 ("HID: add Alps I2C HID Touchpad-Stick support")
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

Author: bagasme

Documentation/hid/hid-alps.rst

@@ -104,8 +104,10 @@ Read value is stored in Value Byte.
 
 
 Packet Format
+-------------
+
 Touchpad data byte
-------------------
+~~~~~~~~~~~~~~~~~~
 
 
 ======= ======= ======= ======= ======= ======= ======= ======= =====
@@ -156,7 +158,7 @@ Zsn_6-0(7bit):
 
 
 StickPointer data byte
-----------------------
+~~~~~~~~~~~~~~~~~~~~~~
 
 ======= ======= ======= ======= ======= ======= ======= ======= =====
 -	b7	b6	b5	b4	b3	b2	b1	b0