[PATCH v2] doc: update LTS maintenance to 3 years

[Thomas Monjalon]

17/01/2024 17:24, Kevin Traynor:
> The existing official policy was to maintain LTS releases for 2 years.
> 
> 19.11 and 20.11 LTS releases were maintained for 3 years and there was
> not significant issues caused by code divergence from main etc.
> 
> Update the policy to indicate 3 years maintenance for LTS releases, but
> note that it depends on community support.
> 
> Signed-off-by: Kevin Traynor <ktraynor at redhat.com>

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