gopls/doc: update go command version support description
Starting with go...@v0.17.0, the _go command version_ narrowed
from 4 versions to 3, and starting with go...@v0.18.0 it narrowed
from 3 versions to 2.
This was documented accurately in the gopls v0.17.0 release notes at
https://go.dev/gopls/release/v0.17.0#go-command-compatibility-the-2-most-recent-major-go-versions.
Update the 'Supported Go versions' section accordingly, and simplify
it to talk about the current policy without the details of how we got
to it.
For golang/go#69321.
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