internal/worker: bring back missing comment

Change-Id: I341b127c5c96efcc685a30eb581c732110e4c086
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/619355
Auto-Submit: Zvonimir Pavlinovic <zpavlinovic@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

internal/worker/govulncheck_scan.go

diff --git a/internal/worker/govulncheck_scan.go b/internal/worker/govulncheck_scan.go
index fc9ed5c..d61d4eb 100644
--- a/internal/worker/govulncheck_scan.go
+++ b/internal/worker/govulncheck_scan.go
@@ -454,6 +454,7 @@
 	return rows
 }
 
+// runScanModule fetches the module version from the proxy, and analyzes its source
 // code for vulnerabilities. The analysis of binaries is done in CompareModule.
 func (s *scanner) runScanModule(ctx context.Context, modulePath, version, mode string) (response *govulncheck.AnalysisResponse, err error) {
 	err = doScan(ctx, modulePath, version, s.insecure, func() (err error) {