[fedora-arm] update target size of blocking ARM images

Hello, QA is trying to consolidate target sizes for all images built by Fedora into a single document that we can easily check, in a response to one of blocking images being oversize again [1]. The document of choice is this wiki page [2]. In a newly added column, the target size of each release-blocking image will be documented. (It can also contain target sizes of non-blocking images, but our major focus is on the blocking ones, of course). The target size will be a blocker for Fedora Final releases. These ARM images are currently considered blocking [2]: Spins/armhfp/images/Fedora-Minimal-armhfp-_RELEASE_MILESTONE_-sda.raw.xz Spins/armhfp/images/Fedora-Xfce-armhfp-_RELEASE_MILESTONE_-sda.raw.xz We're not aware of any size limits on those images at the moment. We'd like you to think over whether this is correct, decide on new numbers if needed, and then write it down into the document [2]. (If you decide to change it in the future, notifying us at the same time is very appreciated.) We'd like to avoid the situation when the image goes oversize and the target size is simply bumped, because it adds delays to the release process. So please think ahead and choose a size that you really want to keep and block on it (You can of course also choose to have no=unlimited target size). Thank you. [1] https://lists.fedoraproject.org/archives/list/test@lists.fedoraproject.or... [2] https://fedoraproject.org/wiki/Releases/28/ReleaseBlocking [3] https://fedoraproject.org/wiki/QA:Testcase_Mediakit_ISO_Size#Expected_Res...