Update xenial.md

Author: nrios14

user/enterprise/xenial.md

@@ -8,17 +8,17 @@ layout: en_enterprise
 
 ## System Setup
 
-**Platform Requirements**: To use the Xenial build containers, the Travis CI installation must be at 2.2.6 or higher. Please be sure to [upgrade](/user/enterprise/upgrading/), if needed, before getting started.
+**Platform Requirements**: To use the Xenial build containers, the Travis CI installation must be at 2.2.6 or higher. Please be sure to [upgrade](/user/enterprise/upgrading/), if needed, before starting.
 
 **Worker Requirements**:
 
-We recommend using a machine with 8 vCPUs and 15 GB of memory and at least 40 GB of disk space. If you're using AWS, that will be their c4.2xlarge instance type. Also, you'll want to run Ubuntu 16.04 or later. Port 22 must be open for SSH during installation and operation.
+We recommend using a machine with 8 vCPUs and 15 GB of memory, and at least 40 GB of disk space. If you're using AWS, that will be their c4.2xlarge instance type. Also, you'll want to run Ubuntu 16.04 or later. Port 22 must be open for SSH during installation and operation.
 
-> _Trusty and Xenial build containers must be on different instances_. To run both Trusty and Xenial builds, at least two worker instances are required.
+> _Trusty and Xenial build containers must be on different instances_. At least two worker instances are required to run both Trusty and Xenial builds.
 
 ## Trusty Build Environment Differences
 
-[Third-party apt-repositories are removed](https://docs.travis-ci.com/user/reference/xenial/#third-party-apt-repositories-removed) to help reduce risk of unrelated interference and allow for faster apt-get updates.
+[Third-party apt-repositories are removed](https://docs.travis-ci.com/user/reference/xenial/#third-party-apt-repositories-removed) to help reduce the risk of unrelated interference and allow for faster apt-get updates.
 
 [Services disabled by default](https://docs.travis-ci.com/user/reference/xenial/#services-disabled-by-default) to speed up boot time and improve performance.