man mention case of null word in ${parameter#word}

[Dan Jacobson]

In the manual, for
       ${parameter#word}
etc. it doesn't mention the case of when word is null.

Furthermore, for
$ a=(123 456);echo ${a[@]/#/1}
1123 1456

one might have never thought this possible, due to the manual only
saying:

       ${parameter/pattern/string}

              ...If string is null, matches of pattern are deleted and
              the / following pattern may be omitted.
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