tweak availability language

Amanda Pinsker · web-flow · commit 14c4331a5159 · 2020-09-08T12:46:45.000-04:00
diff --git a/README.md b/README.md
@@ -6,7 +6,7 @@
 
 ## Availability
 
-GitHub CLI is available for repos hosted on GitHub.com and GitHub Enterprise Server 2.20+. It is available to install on MacOS, Windows, and Linux. 
+GitHub CLI is available for repositories hosted on GitHub.com and GitHub Enterprise Server 2.20+, and to install on macOS, Windows, and Linux. 
 
 
 ## Documentation
