docs: fixed broken links (#416)

PiperOrigin-RevId: 384731479

Source-Author: Google APIs <noreply@google.com>
Source-Date: Wed Jul 14 10:34:16 2021 -0700
Source-Repo: googleapis/googleapis
Source-Sha: 56ffafc26996071e2166fdfec88c325fcb4d8ea4
Source-Link: googleapis/googleapis@56ffafc

synth.metadata

@@ -11,8 +11,8 @@
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "b5532bb5023faa22f8b44f6e14608646178a2ee7",
-        "internalRef": "383440655"
+        "sha": "56ffafc26996071e2166fdfec88c325fcb4d8ea4",
+        "internalRef": "384731479"
       }
     },
     {