Minor fixes to $crate behavior
#1816
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The description of the behavior of passing
$crateto a proc-macro is missing, this PR adds one.Similarly the behavior of
identmatching$crateisn't captured. Every other fragment specifier which matches$crategoes throughPathIdentSegmentwhich does contain$crate, but neitherIDENTIFIER_OR_KEYWORDnorRAW_IDENTIFIERcan (or should) match against$crate.