Add detail to package resolve command

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Co-authored-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: keshav-space

src/packagedcode/swift.py

@@ -22,7 +22,7 @@
 Run the commands below before running the scan:
 
 -  To create a parsable JSON version of the Package.swift manifest, run this: ``swift package dump-package > Package.swift.json``
-``swift package resolve``
+-  To create the Package.resolved lock file, run this: ``swift package resolve``
 """