docs: T8887: backfill Phase 1 commands from recent vyos-1x additions (#2134)

* docs: T8887: backfill Phase 1 commands from recent vyos-1x additions

Documents six CLI features added to vyos-1x between Nov 2025 and May 2026
that were missing from the docs (gap-audit T8886, Phase 1 / T8887):

- policy route-map match source-peer (vyos-1x#5149, T8588)
- high-availability vrrp snmp trap (vyos-1x#5108, T8448)
- protocols segment-routing traffic-engineering subtree (vyos-1x#4994, T6750)
- protocols bgp bmp target monitor pre-policy/post-policy/local-rib
  (vyos-1x#4922, T8133)
- firewall global-options geoip provider/maxmind-* (vyos-1x#4949, T7926/T8049)
- vpn ipsec childless IKE SA option (vyos-1x#4930, T8136)

system frr watchfrr-timeout and service router-advert prefix
base-interface are now documented on rolling via the page rewrites in
vyos-documentation#2251 and vyos-documentation#2132. protocols bgp
parameters as-notation is deferred: rolling carries it commented out;
to be handled in a follow-up.

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* docs: T8887: wrap pre-existing overlong lines in touched files

- route-map, ipsec_general: wrap five pre-existing overlong lines so the
  doc linter (which scans whole modified files) passes on touched files

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* docs: T8887: document BMP prerequisites and mandatory target address

- state that set system frr bmp needs a commit plus a router reboot (or
  FRR restart) before BMP targets can be committed (protocols_bgp.py
  verify)
- add target address (mandatory) and port (default 5000) commands and
  include the address in the example

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* docs: T8887: state SR-TE segment-list commit requirements

Per protocols_segment-routing.py verify(): a segment list needs at least
one index; each index needs an MPLS label or a NAI; an adjacency NAI
needs both source- and destination-identifier; a prefix identifier
needs an algorithm; IS-IS/OSPF import, adjacency/prefix, IPv4/IPv6 and
spf/strict-spf are mutually exclusive. Add a complete example.

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* docs: T8887: escape placeholders in GeoIP and childless cfgcmd headers

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* Apply suggestions from Liydmyla

Co-authored-by: LiudmylaNad <235844477+LiudmylaNad@users.noreply.github.com>

---------

Co-authored-by: Daniil Baturin <daniil@vyos.io>
Co-authored-by: LiudmylaNad <235844477+LiudmylaNad@users.noreply.github.com>

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