Update README.md

Grammar fixes.

README.md

@@ -5,16 +5,16 @@
 Nextflow Tower is an open source monitoring and management platform
 for [Nextflow](https://www.nextflow.io/) workflows developed by [Seqera Labs](https://seqera.io).
 
-## Availibility
+## Availability
 A free-to-use public Tower service is available at [tower.nf](https://tower.nf/).
 
 The community version of Tower is available from this repository. It can be deployed in a 
 user's own environment and has features for single users to monitor their Nextflow 
 pipelines, deployed anywhere.
 
 The fully-featured enterprise version of Tower is available from Seqera Labs. It can be
-deployed in a customers own on-premise or cloud environment and includes advanced workflow
-management, resource optimization and enterprise-grade support. To learn more, please 
+deployed in any on-premise or cloud environment and includes advanced workflow
+management, resource optimization, and enterprise-grade support. To learn more, please 
 visit [Seqera Labs](https://seqera.io).
 
 ## Requirements