The phrasing that channels are updated automatically "[when] all packages have been built" could be
read as "all packages have been built successfully". However, in reality, it only meant to say that
all packages have been *attempted* to be built, so a channel may still contain broken packages. This
patch aims to make this clearer by mentioning that only a selection of packages is required to be
built successfully and by pointing to the files which contain these selections.
72c6a69e6b