Re: [shape-map] conversion to fixed ShapeMap can easily fail

I added [a note](http://shexspec.github.io/shape-map/#query-to-fixed-set) so as to not imply this was a new constraint. This is the first 2119 keyword in the document.
``` html
Note that though <a>shape associations</a> with triple patterns may imply redundant fixed ShapeMap associations, the combination of node and shape in the fixed map MUST be unique.
```
If that address this issue, feel free to close it.

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Received on Wednesday, 14 March 2018 17:24:12 UTC