Fix typo for installing OTel SDK in docs (open-telemetry#200)

Author: NathanielRN

Diff for: sdk-extension/opentelemetry-sdk-extension-aws/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Fix typo for installing OTel SDK in docs
+  ([#200](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/200))
 - Import missing components for docs
   ([#198](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/198))
 - Provide components needed to Configure OTel SDK for Tracing with AWS X-Ray

Diff for: sdk-extension/opentelemetry-sdk-extension-aws/README.rst

@@ -28,7 +28,7 @@ Install the OpenTelemetry SDK package.
 
 ::
 
-    pip install opentelemetry-sdk-extension-aws
+    pip install opentelemetry-sdk
 
 Next, use the provided `AwsXRayIdsGenerator` to initialize the `TracerProvider`.