Quick start page copyedits (#348)

Fix typo and tweak wording.

content/docs/languages/android/quickstart.md

@@ -37,7 +37,7 @@ weight: 10
 
 The example code is part of the [grpc-java][] repo.
 
- 1. [Dowload the repo as a zip file][download] and unzip it, or clone
+ 1. [Download the repo as a zip file][download] and unzip it, or clone
     the repo:
 
     ```sh

content/docs/languages/cpp/quickstart.md

@@ -196,7 +196,7 @@ message HelloReply {
 }
 ```
 
-Edit [examples/protos/helloworld.proto][] and add a new `SayHelloAgain()` method, with the
+Open [examples/protos/helloworld.proto][] and add a new `SayHelloAgain()` method, with the
 same request and response types:
 
 ```protobuf

content/docs/languages/go/quickstart.md

@@ -35,7 +35,7 @@ weight: 10
 
 The example code is part of the [grpc-go][] repo.
 
- 1. [Dowload the repo as a zip file][download] and unzip it, or clone
+ 1. [Download the repo as a zip file][download] and unzip it, or clone
     the repo:
 
     ```sh
@@ -96,7 +96,7 @@ message HelloReply {
 }
 ```
 
-Edit `helloworld/helloworld.proto` and add a new `SayHelloAgain()` method, with
+Open `helloworld/helloworld.proto` and add a new `SayHelloAgain()` method, with
 the same request and response types:
 
 ```protobuf

content/docs/languages/java/quickstart.md

@@ -12,7 +12,7 @@ weight: 10
 
 The example code is part of the [grpc-java][] repo.
 
- 1. [Dowload the repo as a zip file][download] and unzip it, or clone
+ 1. [Download the repo as a zip file][download] and unzip it, or clone
     the repo:
 
     ```sh

content/docs/languages/web/quickstart.md

@@ -16,7 +16,7 @@ weight: 10
 
 The example code is part of the [grpc-web][] repo.
 
- 1. [Dowload the repo as a zip file][download] and unzip it, or clone
+ 1. [Download the repo as a zip file][download] and unzip it, or clone
     the repo:
 
     ```sh