FreeBSD/doc 049909d (r52888)en_US.ISO8859-1/books/handbook/cutting-edge chapter.xml

There is no /boot/GENERIC.  Reword to advise on checking the installed kernel
and better inform users on the upgrade path.

PR:             235627
DeltaFile
+3-5en_US.ISO8859-1/books/handbook/cutting-edge/chapter.xml
+3-51 files

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