[website_docs] Link to website spec pages (#3868)

website_docs/manual_instrumentation.md

@@ -162,7 +162,7 @@ span.setAttribute("http.url", url.toString());
 
 Some of these operations represent calls that use well-known protocols like HTTP or database calls.
 For these, OpenTelemetry requires specific attributes to be set. The full attribute list is
-available in the [Semantic Conventions](https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/semantic_conventions/README.md) in the cross-language specification.
+available in the [Semantic Conventions]({{< relref "/docs/reference/specification/trace/semantic_conventions/" >}}) in the cross-language specification.
 
 ### Create Spans with events
 
@@ -441,14 +441,14 @@ See the supported configuration options in the module's [README](https://github.
 [AlwaysOffSampler]: https://github.com/open-telemetry/opentelemetry-java/blob/main/sdk/trace/src/main/java/io/opentelemetry/sdk/trace/samplers/AlwaysOffSampler.java
 [ParentBased]: https://github.com/open-telemetry/opentelemetry-java/blob/main/sdk/trace/src/main/java/io/opentelemetry/sdk/trace/samplers/ParentBasedSampler.java
 [TraceIdRatioBased]: https://github.com/open-telemetry/opentelemetry-java/blob/main/sdk/trace/src/main/java/io/opentelemetry/sdk/trace/samplers/TraceIdRatioBasedSampler.java
-[Library Guidelines]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/library-guidelines.md
+[Library Guidelines]: {{< relref "/docs/reference/specification/library-guidelines" >}}
 [OpenTelemetry Collector]: https://github.com/open-telemetry/opentelemetry-collector
-[OpenTelemetry Registry]: https://opentelemetry.io/registry/?s=exporter
+[OpenTelemetry Registry]: {{< relref "/registry/" >}}?component=exporter&language=java
 [OpenTelemetry Website]: https://opentelemetry.io/
-[Obtaining a Tracer]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#get-a-tracer
-[Semantic Conventions]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/semantic_conventions
-[Instrumentation Library]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/glossary.md#instrumentation-library
-[instrumented library]: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/glossary.md#instrumented-library
+[Obtaining a Tracer]: {{< relref "/docs/reference/specification/trace/api#get-a-tracer" >}}
+[Semantic Conventions]: {{< relref "/docs/reference/specification/trace/semantic_conventions" >}}
+[Instrumentation Library]: {{< relref "/docs/reference/specification/glossary#instrumentation-library" >}}
+[instrumented library]: {{< relref "/docs/reference/specification/glossary#instrumented-library" >}}
 
 ## Logging and Error Handling