docs: Fix out of date docs (#5480)

Command was moved, CLI interface changed slightly.

Author: wenottingham

vulnfeeds/cmd/converters/cve/nvd-cve-osv/README.md

@@ -19,10 +19,10 @@ mkdir /tmp/nvd /tmp/nvd2osv
 mv test_data/nvdcve-2.0/${CVE}.json /tmp/nvd
 gcloud storage cp "gs://osv-test-cve-osv-conversion/cpe_repos/cpe_product_to_repo.json" "/tmp"
 
-go run cmd/nvd-cve-osv/main.go \
-    --cpe_repos "/tmp/cpe_product_to_repo.json" \
-    --nvd_json "/tmp/nvd/${CVE}.json" \
-    --out_dir "/tmp/nvd2osv"
+go run cmd/converters/cve/nvd-cve-osv/main.go \
+    --cpe-repos "/tmp/cpe_product_to_repo.json" \
+    --nvd-json "/tmp/nvd/${CVE}.json" \
+    --out-dir "/tmp/nvd2osv"
 
 cat /tmp/nvd2osv/*/*/${CVE}.json
 ```