doc: claim ABI version 85 for Electron 11

PR-URL: #33375
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/abi_version_registry.json

@@ -1,5 +1,7 @@
 {
   "NODE_MODULE_VERSION": [
+    { "modules": 85, "runtime": "electron", "variant": "electron",             "versions": "11" },
+    { "modules": 84, "runtime": "node",     "variant": "v8_8.3",               "versions": "15.0.0-pre" },
     { "modules": 83, "runtime": "node",     "variant": "v8_8.1",               "versions": "14.0.0" },
     { "modules": 82, "runtime": "electron", "variant": "electron",             "versions": "10" },
     { "modules": 81, "runtime": "node",     "variant": "v8_7.9",               "versions": "14.0.0-pre" },