docs: Specify that OFP should adapt to ODP LTS releases.
docs: Specify that OFP should adapt to ODP LTS releases.

ODP Long Term Support (LTS) releases are the ones that are actually
supported by ODP and vendors alike, so those are the ODP releases OFP
should adapt to.

Signed-off-by: Jere Leppänen <14957520de8d9815e0c353a07fe23c737f0171e9@nokia.com>
Reviewed-by: Sorin Vultureanu <8013ba55f8675034bc2ab0d6c3a1c9650437ca36@enea.com>

OpenFastPath/ofp,TolikH/ofp,TolikH/ofp,TolikH/ofp,OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp