Update insights-trivy/README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: bomoko

insights-trivy/README.md

@@ -3,6 +3,4 @@
 This image simply extends the standard Trivy docker image to include the vulnerability databases,
 rather than downloading them every time it is invoked.
 
-It results in a bigger image, but the way Insights scans work often require the _entire_ DB to be downloaded
-every time it is run (which is multiple times a build).
-
+It results in a bigger image, but since Insights scans often require downloading the entire database, this approach reduces redundant downloads.