man/systemd-stub: reword descriptions of .dtb and .profile sections
- The text was clearly edited in variuos places to e.g. allow multiple
sections, so it first said that sections are singletons, and immediately
after that that some section are not.
- Replace "regardless of the kernel" with "regardless of the kernel version".
The kernel is very much involved e.g. in loading of the initrds.
- Various other small rewordings to make the text more legible.
projects / thirdparty / systemd.git / commit
