RTRS/rtrs: clean up rtrs headers kernel-doc

RTRS/rtrs: clean up rtrs headers kernel-doc

Fix all (30+) kernel-doc warnings in rtrs.h and rtrs-pri.h.  The changes
are:

- add ending ':' to enum member names
- change enum description separators from '-' to ':'
- add "struct" keyword to kernel-doc for structs where missing
- fix enum names in enum rtrs_clt_con_type
- add a '-' separator and drop the "()" in enum rtrs_clt_con_type
- convert struct rtrs_addr to kernel-doc format
- add missing struct member descriptions for struct rtrs_attrs

Link: https://patch.msgid.link/r/20251129022146.1498273-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>