fix: add docs on extracting non-github repo
Other souce hosting services will use different url formats for their
repo archives, for example android.googlesource.com.
// Binary kzip_validator checks the contents of a kzip against a code repo and
// compares file coverage.
//
-// Example:
+// Usage:
// kzip_validator -kzip <kzip-file> -local_repo <repo-root-dir> -lang cc,h
// kzip_validator -kzip <kzip-file> -repo_url <repo-url> -lang java [-version <hash>]
+//
+// Examples:
+// Github repos use default args (.zip, /archive/, master):
+// kzip_validator -kzip <kzip-file> -repo_url https://github.com/google/guava
+//
+// Other repository hosting services may require additional arguments:
+// kzip_validator -kzip <kzip-file> \
+// -repo_url https://android.googlesource.com/project/superproject
+// -archive_prefix "+archive" \
+// -archive_format ".tar.gz" \
+// -archive_subdir "" \
+// -lang "cc,h"
+//
package main
import (
