[LOW] STR #4241: IPP backend doc reads "default version 1.1" but actually it is 2.0

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http://www.cups.org/documentation.php/doc-1.6/network.html
reads
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Table 2: IPP URI Options
...
version=... instead of the default version 1.1.
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but in backend/ipp.c there is
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  version     = 20;
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which indicates that the actual default version is 2.0
in contrast to the documentation.

Link: https://www.cups.org/str.php?L4241
Version: 1.6.1