docs: fixed broken links (#416)
docs: fixed broken links (#416)

PiperOrigin-RevId: 384731479

Source-Author: Google APIs <1505422b2465e9a84f6fdfaa161078890c593f06@google.com>
Source-Date: Wed Jul 14 10:34:16 2021 -0700
Source-Repo: googleapis/googleapis
Source-Sha: 56ffafc26996071e2166fdfec88c325fcb4d8ea4
Source-Link: https://github.com/googleapis/googleapis/commit/56ffafc26996071e2166fdfec88c325fcb4d8ea4
googleapis/java-monitoring-dashboards,googleapis/java-monitoring-dashboards,googleapis/java-monitoring-dashboards