(DOCS): Edit Amazon S3 (RocketChat#1459)

Author: paulofariadias

administrator-guides/file-upload/amazon-s3/README.md

@@ -1,6 +1,6 @@
 # Amazon S3
 
-You'll need to set the following _CORS Configuration_ to your bucket:
+Set set the following _CORS Configuration_ to your bucket:
 
 ```xml
 <?xml version="1.0" encoding="UTF-8"?>
@@ -17,27 +17,27 @@ You'll need to set the following _CORS Configuration_ to your bucket:
 </CORSConfiguration>
 ```
 
-**Important**: Replace `*ROCKET_CHAT_DOMAIN*` with the domain of your Rocket Chat installation, e.g. `https://chat.example.com`. If for some reason you want to make your CORS configuration ridiculously insecure, you can set it to `*` to allow CORS requests from any host on the Internet, but do so at your own risk.
+**Note**: Replace `*ROCKET_CHAT_DOMAIN*` with the domain of your Rocket Chat installation, e.g. `https://chat.example.com`. If for some reason you want to make your CORS configuration ridiculously insecure, you can set it to `*` to allow CORS requests from any host on the Internet, but do so at your own risk.
 
-## Basic configuration
+## Basic Configuration
 
-You'll need to set the following fields:
+Set the following fields:
 
 Config. Name | Description
 ------------ | -------------
-**Amazon S3 bucket name** | The bucket name you've created on Amazon S3
+**Amazon S3 bucket name** | The bucket name you created on Amazon S3
 **Amazon S3 AWSAccessKeyId** | Your Amazon Access Key ID (optional)
 **Amazon S3 AWSSecretAccessKey** | Your Amazon Secret Access Key (optional)
 
-**Note**: If no `AWSAccessKeyId` and `AWSSecretAccessKey` are set, the underlying AWS SDK will fallback to trying to retrieve credentials from the [usual locations](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/setting-credentials-node.html).
+**Note**: If no `AWSAccessKeyId` and `AWSSecretAccessKey` are set, the underlying AWS SDK will fallback and try to retrieve credentials from the [usual locations](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/setting-credentials-node.html).
 
-## Advanced configuration
+## Advanced Configuration
 
-The following fields are optional, you don't need to set them to get upload to S3 working.
+The following fields are optional, and you don't need to set them to get the upload to S3 working.
 
 Config. Name | Description
 ------------ | -------------
-**Region** | If you have created your bucket on region different from the US Standard, you **have** to set their code here (see a list of region codes [here](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-available-regions))
+**Region** | If you created your bucket on a region different from the US Standard, this is where you **must** set their code (see a list of region codes [here](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-available-regions))
 **Amazon S3 acl** | A _Canned ACL_ configuration (see a full list [here](http://docs.aws.amazon.com/AmazonS3/latest/dev/acl-overview.html#canned-acl))
-**CDN domain for downloads** | If you had set a CDN for your bucket, put it here
-**Bucket URL** | Override URL to which files are uploaded. This URL will also be used for downloads unless a CDN is given
+**CDN domain for downloads** | If you set a CDN for your bucket, put it here
+**Bucket URL** | Override URL to which files are uploaded. This URL is also used for downloads, unless youset a CDN.