add fedora kernel notes

active/os_fedora/fedora.md

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+# Fedora
+
+## Kernel Rescue
+
+1. Check that `/boot` and `/boot/efi` aren't full
+2. `mkdir -p /boot/efi/loader/entries`
+3. `mkdir -p /boot/efi/$(cat /etc/machine-id)`
+4. Check for other missing directories and create as needed
+5. `dracut -f --regenerate-all` to regenerate missing kernels
+6. `dnf reinstall kernel*` to rerun kernel installation scripts