Fixes #

## Changes

This fixes the link to a section/heading which was changed as part of
#4887

For non-trivial changes, follow the [change proposal
process](https://github.com/open-telemetry/opentelemetry-specification/blob/main/CONTRIBUTING.md#proposing-a-change).

* [ ] Related issues #
* [ ] Related [OTEP(s)](https://github.com/open-telemetry/oteps) #
* [ ] Links to the prototypes (when adding or changing features)
* [ ]
[`CHANGELOG.md`](https://github.com/open-telemetry/opentelemetry-specification/blob/main/CHANGELOG.md)
file updated for non-trivial changes
* For trivial changes, include `[chore]` in the PR title to skip the
changelog check
* [ ] [Spec compliance
matrix](https://github.com/open-telemetry/opentelemetry-specification/blob/main/spec-compliance-matrix/template.yaml)
updated if necessary

### Traces

- Add normative language to the Tracing API/SDK spec concurrency
requirements.

([#4887](#4887))

### Metrics

- Add additional in-development requirements to metric start timestamps.

([#4807](#4807),

[#4902](#4902))

### Logs

- Stabilize optional `Exception` parameter to Logger Emit.

([#4858](#4858))

### Compatibility

- Stabilize Prometheus Summary to OTLP Summary transformation.

([#4872](#4872))

### SDK Configuration

- Declarative configuration: allow language-specific prefixes in
environment
  variable substitution.

([#4891](#4891))
- Mark significant portions of declarative configuration as stable.

([#4568](#4568))