chore: update CODEOWNERS and proto fields (#699)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* fix: use repo metadata to populate nodejs CODEOWNERS

* fix: use repo metadata to populate nodejs CODEOWNERS

* chore: small formatting tweaks

Co-authored-by: Benjamin Coe <bencoe@google.com>

Source-Author: Justin Beckwith <justin.beckwith@gmail.com>
Source-Date: Wed Feb 3 15:09:55 2021 -0800
Source-Repo: googleapis/synthtool
Source-Sha: 318e351e26ba65b2b3cfa3f61b3b64e3540c3525
Source-Link: googleapis/synthtool@318e351

packages/google-cloud-node/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-speech.git",
-        "sha": "d6c269dfae1e1f4bc6f0eabf80b64d0e09025dea"
+        "sha": "be7ecff19d02a62118ad62da19509cc3f75cae51"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "57c23fa5705499a4181095ced81f0ee0933b64f6"
+        "sha": "318e351e26ba65b2b3cfa3f61b3b64e3540c3525"
       }
     }
   ],