Backfill API documentation for Stacks endpoint

[#73431654]

Signed-off-by: Dave Liebreich <dliebreich@pivotallabs.com>
Backfill API documentation for App stats endpoint

[#73431654]

Signed-off-by: Dave Liebreich <dliebreich@pivotallabs.com>
Backfill API documentation for the Users summary endpoint

[#73431654]

Signed-off-by: Dave Liebreich <dliebreich@pivotallabs.com>
Backfill API documentation for the User endpoints

[#73431654]

Signed-off-by: Dave Liebreich <dliebreich@pivotallabs.com>