docs: npm v9 creates package-lock.json v3 (#6187)

Author: tuukka

docs/lib/content/configuring-npm/package-lock-json.md

@@ -112,12 +112,9 @@ the npm registry.  Lockfiles generated by npm v7 will contain
 * No version provided: an "ancient" shrinkwrap file from a version of npm
   prior to npm v5.
 * `1`: The lockfile version used by npm v5 and v6.
-* `2`: The lockfile version used by npm v7, which is backwards compatible
-  to v1 lockfiles.
-* `3`: The lockfile version used by npm v7, _without_ backwards
-  compatibility affordances.  This is used for the hidden lockfile at
-  `node_modules/.package-lock.json`, and will likely be used in a future
-  version of npm, once support for npm v6 is no longer relevant.
+* `2`: The lockfile version used by npm v7 and v8. Backwards compatible to v1
+  lockfiles.
+* `3`: The lockfile version used by npm v9. Backwards compatible to npm v7.
 
 npm will always attempt to get whatever data it can out of a lockfile, even
 if it is not a version that it was designed to support.