Remove $FreeBSD$: one-line .c comment pattern

Remove /^/[*/]\s*\$FreeBSD\$.*\n/

Fix some common typos in comments

- occured -> occurred
- normaly -> normally
- controling -> controlling
- fileds -> fields
- insterted -> inserted
- outputing -> outputting

MFC after: 1 week

Move sys/boot to stand. Fix all references to new location

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