Add header link to documentation.

Screencast: https://screencast.googleplex.com/cast/NDc5Mjg1NDMwMjk0OTM3Nnw4MGMwY2M1Ni03ZQ

Bug: b/322993646
Test: npm run test:unit:ci
Change-Id: I1e946f74121254aca4dbe562030ce5c7f88dde19
2 files changed