Expand word from dev to development (#541)

Author: sanscontext

src/segment-app/set-up-envs.md

@@ -2,7 +2,7 @@
 title: Prod and Testing Environments in Segment
 ---
 
-We recommend that instead of setting up separate workspaces for different environments (local/dev/prod), you set up one workspace and make each of these environments a _different source_. 
+We recommend that instead of setting up separate workspaces for different environments (local/development/prod), you set up one workspace and make each of these environments a _different source_. 
 
 We bill per workspace, and on our Team or Business plans you can create as many sources as you need. Each Segment source will have its own Write Key, so you can easily keep things separate.