[For 1.0] Add WARNING for TraceIdRatioBased algorithm stability. (#1414)
[For 1.0] Add WARNING for TraceIdRatioBased algorithm stability. (#1414)

* [For 1.0] Add WARNING for ParentBased algorithm stability.

* Update specification/trace/sdk.md

Co-authored-by: Armin Ruech <5375d2e98a78036adfbf90c7f7841c3894b65d4b@dynatrace.com>

* Remove non-working link to ParentBased.

* Add back link with correct casing.

* Reword.

Co-authored-by: Armin Ruech <5375d2e98a78036adfbf90c7f7841c3894b65d4b@dynatrace.com>
Co-authored-by: Bogdan Drutu <3f8e17047c2434e5c82a61403e56b9ef3e226d99@gmail.com>
open-telemetry/opentelemetry-specification,open-telemetry/opentelemetry-specification