little problems in the spec that we have noted over time.
Fixed a couple of LaTeX mistakes; adjusted FutureOr section
The 'Type FutureOr' section was adjusted in order to avoid duplicate
subtype rules (the ones that we have had in section 'Type FutureOr'
until now are duplicates of rules in \ref{subtypeRules}).
Also changed the name of \basetype to \futureOrBase, because the former
is too generic to be helpful for readers.
Change-Id: I8d83cf1a0af275a930fbbb94cf59a9d758066583
Reviewed-on: https://dart-review.googlesource.com/c/90061
Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
Erik Ernst
da6938a5b2