doc: add registry numbers for Electron 19 and 20

PR-URL: nodejs#41814
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Tierney Cyren <hello@bnb.im>

doc/abi_version_registry.json

@@ -1,5 +1,7 @@
 {
   "NODE_MODULE_VERSION": [
+    { "modules": 107,"runtime": "electron", "variant": "electron",             "versions": "20" },
+    { "modules": 106,"runtime": "electron", "variant": "electron",             "versions": "19" },
     { "modules": 105,"runtime": "node",     "variant": "v8_9.8",               "versions": "18.0.0-pre" },
     { "modules": 104,"runtime": "node",     "variant": "v8_9.7",               "versions": "18.0.0-pre" },
     { "modules": 103,"runtime": "electron", "variant": "electron",             "versions": "18" },