[Bug 216096] Few typos in comments in buf_ring.h

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216096

            Bug ID: 216096
           Summary: Few typos in comments in buf_ring.h
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bltsrc at mail.ru

r309414

sys/sys/buf_ring.h

Used to return a buffer (most likely already there)
 * to the top od the ring. The caller should *not*
 * have used any dequeue to pull it out of the ring
 * but instead should have used the peek() function.
 * This is normally used where the transmit queue


 typo here -> * of a driver is full, and an MUBF must be returned.
 should be ... mbuf ..., not mubf

 * Most likely whats in the ring-buffer is what
 * is being put back (since it was not removed), but
 * sometimes the lower transmit function may have
 * done a pullup or other function that will have

 typo here -> * changed it. As an OPTIMZATION we always put it
 should be ... optimization(or optimisation)

 * back (since jhb says the store is probably cheaper),
 * if we have to do a multi-queue version we will need
 * the compare and an atomic.

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