Editorial: Resolve declarative config TODOs (#4394)

Related to #4374.

Remove a couple of TODOs which already have resolutions.

CHANGELOG.md

@@ -39,6 +39,8 @@ release.
 - Define syntax for escaping declarative configuration environment variable
   references.
   ([#4375](https://github.com/open-telemetry/opentelemetry-specification/pull/4375))
+- Resolve various declarative config TODOs.
+  ([#4394](https://github.com/open-telemetry/opentelemetry-specification/pull/4394))
 
 ### Common
 

specification/configuration/data-model.md

@@ -31,7 +31,7 @@ The data model itself is an abstraction with multiple built-in representations:
 
 ### Stability definition
 
-TODO: define stability guarantees and backwards compatibility
+See `opentelemetry-configuration` [stability definition](https://github.com/open-telemetry/opentelemetry-configuration?tab=readme-ov-file#stability-definition).
 
 ### File-based configuration model
 

specification/configuration/sdk-environment-variables.md

@@ -396,16 +396,17 @@ configuration models, or overlay values from environment variables on top of a
 configuration model. Implementations MAY provide a mechanism to customize the
 configuration model parsed from `OTEL_EXPERIMENTAL_CONFIG_FILE`.
 
-Users are encouraged to use the `sdk-config.yaml` (TODO: Add link when
-available) as a starting point for `OTEL_EXPERIMENTAL_CONFIG_FILE`. This file
-represents a common SDK configuration scenario, and includes environment
-variable substitution references to environment variables which are otherwise
-ignored.
+Users are encouraged to
+use [`sdk-migration-config.yaml`](https://github.com/open-telemetry/opentelemetry-configuration/blob/main/examples/sdk-migration-config.yaml)
+as a starting point for `OTEL_EXPERIMENTAL_CONFIG_FILE`. This file represents a
+common SDK configuration scenario, and includes environment variable
+substitution references to environment variables which are otherwise ignored.
+Alternatively, [`sdk-config.yaml`](https://github.com/open-telemetry/opentelemetry-configuration/blob/main/examples/sdk-config.yaml)
+offers a common SDK configuration starting point without environment variable
+substitution references.
 
 TODO: deprecate env vars which are not
 compatible ([#3967](https://github.com/open-telemetry/opentelemetry-specification/issues/3967))
-TODO: provide solution for platforms to contribute to
-configure ([#3966](https://github.com/open-telemetry/opentelemetry-specification/issues/3966))
 
 ## Language Specific Environment Variables