Move `upload resource` and `target resource` to Conventions and Definitions

[ioggstream]

Question

I suggest to move "upload resource" and "target resource" to "Conventions and Definitions".

While it is OK to refer to the final resource as the "target resource", it may have a slightly different meaning wrt HTTP, thing that's probably worth mentioning in some way.

Note

In other specs we have "Notational Conventions", is there a specific reason for having a different section name?