Update alpha version in docs (#701)

README.md

@@ -40,7 +40,7 @@ necessary targets:
 
 ```swift
 dependencies: [
-  .package(url: "https://github.com/grpc/grpc-swift.git", from: "1.0.0-alpha.6")
+  .package(url: "https://github.com/grpc/grpc-swift.git", from: "1.0.0-alpha.9")
 ]
 ```
 

docs/basic-tutorial.md

@@ -39,7 +39,7 @@ To download the example, clone the latest release in `grpc-swift` repository by
 running the following command:
 
 ```sh
-$ git clone -b 1.0.0-alpha.6 https://github.com/grpc/grpc-swift
+$ git clone -b 1.0.0-alpha.9 https://github.com/grpc/grpc-swift
 ```
 
 Then change your current directory to `grpc-swift/Sources/Examples/RouteGuide`:

docs/quick-start.md

@@ -28,7 +28,7 @@ and other tutorials):
 
 ```sh
 $ # Clone the repository at the latest release to get the example code:
-$ git clone -b 1.0.0-alpha.6 https://github.com/grpc/grpc-swift
+$ git clone -b 1.0.0-alpha.9 https://github.com/grpc/grpc-swift
 $ # Navigate to the repository
 $ cd grpc-swift/
 ```