[Documentation] Fix anchor links in Getting Started guide
[Documentation] Fix anchor links in Getting Started guide

Resolves https://github.com/material-components/material-components-android/pull/1794

GIT_ORIGIN_REV_ID=44ee6a2db66b3a0b113fffe248e1ba12742acfa2
PiperOrigin-RevId: 336877400

material-components/material-components-android