Fix deprecation of Extract/Inject in otelgrpc

CHANGELOG.md

@@ -30,6 +30,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 - `WithSpanOptions` in `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc` is deprecated.
   It is only used by the deprecated interceptor, and is unused by `NewClientHandler` and `NewServerHandler`. (#7601)
+- `Extract` and `Inject` in `go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc` are deprecated.
+  These functions were initially exposed in the public API, but are now considered unnecessary. (#7689)
 
 ### Removed
 

instrumentation/google.golang.org/grpc/otelgrpc/metadata_supplier.go

@@ -42,6 +42,7 @@ func (s *metadataSupplier) Keys() []string {
 // Inject injects correlation context and span context into the gRPC
 // metadata object. This function is meant to be used on outgoing
 // requests.
+//
 // Deprecated: Unnecessary public func.
 func Inject(ctx context.Context, md *metadata.MD, opts ...Option) {
 	c := newConfig(opts)
@@ -64,6 +65,7 @@ func inject(ctx context.Context, propagators propagation.TextMapPropagator) cont
 // Extract returns the correlation context and span context that
 // another service encoded in the gRPC metadata object with Inject.
 // This function is meant to be used on incoming requests.
+//
 // Deprecated: Unnecessary public func.
 func Extract(ctx context.Context, md *metadata.MD, opts ...Option) (baggage.Baggage, trace.SpanContext) {
 	c := newConfig(opts)