Typo in vitut.txt

[adr <adr%SDF.ORG@localhost>]

/usr/share/doc/usd/vi/vitut.txt lines 943-984/2970 ...

[...]
An ordinary delete command saves the text in the
unnamed  buffer,  so  that an ordinary put can move it elsewhere.
However, the unnamed buffer is lost when you change files, so  to
move  text  from  one  file  to another you should use an unnamed
buffer.
[...]

"...you shoud use a _named_ buffer."

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adr.