flow_dissector: Address kdoc warnings

Address a number of warnings flagged by
./scripts/kernel-doc -none include/net/flow_dissector.h

 include/net/flow_dissector.h:23: warning: Function parameter or member 'addr_type' not described in 'flow_dissector_key_control'
 include/net/flow_dissector.h:23: warning: Function parameter or member 'flags' not described in 'flow_dissector_key_control'
 include/net/flow_dissector.h:46: warning: Function parameter or member 'padding' not described in 'flow_dissector_key_basic'
 include/net/flow_dissector.h:145: warning: Function parameter or member 'tipckey' not described in 'flow_dissector_key_addrs'
 include/net/flow_dissector.h:157: warning: cannot understand function prototype: 'struct flow_dissector_key_arp '
 include/net/flow_dissector.h:171: warning: cannot understand function prototype: 'struct flow_dissector_key_ports '
 include/net/flow_dissector.h:203: warning: cannot understand function prototype: 'struct flow_dissector_key_icmp '

Also improve indentation on adjacent lines to those changed
to address the above.

No functional changes intended.
Signed-off-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20230419-flow-dissector-kdoc-v1-1-1aa0cca1118b@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/flow_dissector.h

@@ -15,6 +15,8 @@ struct sk_buff;
 /**
  * struct flow_dissector_key_control:
  * @thoff:     Transport header offset
+ * @addr_type: Type of key. One of FLOW_DISSECTOR_KEY_*
+ * @flags:     Key flags. Any of FLOW_DIS_(IS_FRAGMENT|FIRST_FRAGENCAPSULATION)
  */
 struct flow_dissector_key_control {
 	u16	thoff;
@@ -38,6 +40,7 @@ enum flow_dissect_ret {
  * struct flow_dissector_key_basic:
  * @n_proto:  Network header protocol (eg. IPv4/IPv6)
  * @ip_proto: Transport header protocol (eg. TCP/UDP)
+ * @padding:  Unused
  */
 struct flow_dissector_key_basic {
 	__be16	n_proto;
@@ -135,6 +138,7 @@ struct flow_dissector_key_tipc {
  * struct flow_dissector_key_addrs:
  * @v4addrs: IPv4 addresses
  * @v6addrs: IPv6 addresses
+ * @tipckey: TIPC key
  */
 struct flow_dissector_key_addrs {
 	union {
@@ -145,14 +149,12 @@ struct flow_dissector_key_addrs {
 };
 
 /**
- * flow_dissector_key_arp:
- *	@ports: Operation, source and target addresses for an ARP header
- *              for Ethernet hardware addresses and IPv4 protocol addresses
- *		sip: Sender IP address
- *		tip: Target IP address
- *		op:  Operation
- *		sha: Sender hardware address
- *		tpa: Target hardware address
+ * struct flow_dissector_key_arp:
+ * @sip: Sender IP address
+ * @tip: Target IP address
+ * @op:  Operation
+ * @sha: Sender hardware address
+ * @tha: Target hardware address
  */
 struct flow_dissector_key_arp {
 	__u32 sip;
@@ -163,10 +165,10 @@ struct flow_dissector_key_arp {
 };
 
 /**
- * flow_dissector_key_tp_ports:
+ * struct flow_dissector_key_ports:
  * @ports: port numbers of Transport header
- *		src: source port number
- *		dst: destination port number
+ * @src: source port number
+ * @dst: destination port number
  */
 struct flow_dissector_key_ports {
 	union {
@@ -195,10 +197,10 @@ struct flow_dissector_key_ports_range {
 };
 
 /**
- * flow_dissector_key_icmp:
- *		type: ICMP type
- *		code: ICMP code
- *		id:   session identifier
+ * struct flow_dissector_key_icmp:
+ * @type: ICMP type
+ * @code: ICMP code
+ * @id:   Session identifier
  */
 struct flow_dissector_key_icmp {
 	struct {