Detail: Merge some whitespace fixes from release.

svn path=/trunk/boost/lambda/; revision=80349
Fixed 'the the' in comments; Refs #7714

svn path=/trunk/boost/lambda/; revision=82235
Remove name of unused parameter.  Fixes #8033.

svn path=/trunk/boost/lambda/; revision=82932
Handle nullary result_of.  Fixes #6914.

svn path=/trunk/boost/lambda/; revision=82935
Handle const lambda functors for nullary result_of.  Fixes #6914.

svn path=/trunk/boost/lambda/; revision=83020