Correction of double paragraph in documentation

svn path=/branches/release/libs/serialization/; revision=49494
Merge [49469], fix more newlines. Refs #2441. Probably not finished as subversion isn't being very helpful.

svn path=/branches/release/libs/serialization/; revision=49579
unique naming for export instantiation

svn path=/branches/release/boost/serialization/; revision=50546
Merge serialization library from trunk into release branch

svn path=/branches/release/boost/archive/; revision=50644
merge of cmake build files from trunk per beman

svn path=/branches/release/libs/serialization/; revision=50756