Minor readme fixes for examples (#1513)

Author: cijothomas

examples/README.md

@@ -1,41 +1,67 @@
 # Examples
+
 This directory contains some examples that should help you get start crates from `opentelemetry-rust`.
 
 ## log-basic
-**Logs**
 
 This example uses following crates from this repo:
+
 - opentelemetry(log)
 - opentelemetry-appender-log
 - opentelemetry-stdout
 
 Check this example if you want to understand *how to instrument logs using opentelemetry*.
 
 ## metrics-basic
-**Metrics**
 
 This example uses following crates from this repo:
+
 - opentelemetry(metrics)
 - opentelemetry-stdout
 
 Check this example if you want to understand *how to instrument metrics using opentelemetry*.
 
+## metrics-advanced
+
+This example uses following crates from this repo:
+
+- opentelemetry(metrics)
+- opentelemetry-stdout
+
+This builds on top of the metrics-basic,
+and shows advanced features in Metrics SDK like using Views.
+
+## tracing-grpc
+
+This example uses following crates from this repo:
+
+- opentelemetry(tracing)
+- opentelemetry-stdout
+
+The application is built using `tokio`.
+
+Check this example if you want to understand *how to create spans and
+propagate/restore context in OpenTelemetry* in a gRPC client-server application.
+
 ## tracing-http-propagator
-**Tracing**
 
 This example uses following crates from this repo:
+
 - opentelemetry(tracing)
 - opentelemetry-http
 - opentelemetry-stdout
 
-## tracing-grpc
-**Tracing**
+Check this example if you want to understand *how to create spans and
+propagate/restore context in OpenTelemetry* in an HTTP client-server
+application.
+
+## tracing-jaeger
 
 This example uses following crates from this repo:
 
 - opentelemetry(tracing)
-- opentelemetry-stdout
+- opentelemetry-otlp
 
 The application is built using `tokio`.
 
-Check this example if you want to understand *how to create spans and propagate/restore context in OpenTelemetry*.
+Check this example if you want to understand *how to use OTLP Exporter to export traces to Jaeger*.

opentelemetry-sdk/benches/attribute_set.rs

@@ -3,7 +3,7 @@ use opentelemetry::KeyValue;
 use opentelemetry_sdk::AttributeSet;
 
 // Run this benchmark with:
-// cargo bench --bench metric_counter
+// cargo bench --bench attribute_set --features=metrics
 
 fn criterion_benchmark(c: &mut Criterion) {
     attribute_set(c);

opentelemetry/src/common.rs

@@ -6,7 +6,7 @@ use std::{fmt, hash};
 ///
 /// See the [attribute naming] spec for guidelines.
 ///
-/// [attribute naming]: https://github.com/open-telemetry/opentelemetry-specification/blob/v1.9.0/specification/common/attribute-naming.md
+/// [attribute naming]: https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/attribute-naming.md
 #[derive(Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub struct Key(OtelString);