idr: Add documentation
Move the idr kernel-doc to its own idr.rst file and add a few
paragraphs about how to use it. Also add some more kernel-doc.
Signed-off-by: 
Matthew Wilcox <mawilcox@microsoft.com>
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Move the idr kernel-doc to its own idr.rst file and add a few
paragraphs about how to use it. Also add some more kernel-doc.
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>