chore: Switch Apollo Engine Reporting comments to `tsdoc`. (#2660)
chore: Switch Apollo Engine Reporting comments to `tsdoc`. (#2660)

Ran a quick transformation on these comments in the
`apollo-engine-reporting` package to change them to `tsdoc` format.

By using the C-style `tsdoc` comments, these descriptions will actually be
displayed within editors that support JSDoc (i.e. most).
apollostack/apollo-server