typo in insight docs.

docs/insight/index.md

@@ -8,7 +8,7 @@ Yeoman Insight is the metrics reporting tool used by the Yeoman CLI to record an
 
 There are a number of useful questions we can answer with good metrics:
 
-- numer of downloads
+- number of downloads
   - Users install Yeoman from the command line (`$ curl -L get.yeoman.io | bash`). We record a "download" page view when the CLI is run for the first time. This is essentially equivalent to the # of installs. Users are unlikely to run the install command and never execute a yeoman task.
   - *Note: Github does not provide a way to track # of .zip/.tar.gz downloads from the project page.*
 - 7, 14, 30-day actives