(minor) typo s/completion/compression

Author: vindarel

scripting.md

@@ -116,7 +116,7 @@ Be aware that `ros build` adds core compression by default. That adds
 a significant startup overhead of the order of 150ms (for a simple
 app, startup time went from about 30ms to 180ms). You can disable it
 with `ros build --disable-compression <app.ros>`. Of course, core
-completion reduces your binary size significantly. See the table
+compression reduces your binary size significantly. See the table
 below, "Size and startup times of executables per implementation".
 
 We'll finish with a word on