dynamic_bitset: documentation:

    * improved documentation of constructor from block range, with notes about library issue 438
    * fixed/improved wording and markup in several places
    * partially adjusted word wrap, for consistency


[SVN r49346]

libs/dynamic_bitset

@@ -1 +1 @@
-Subproject commit e953b16ceeb6fe0c9466ab2c31732c79003d6909
+Subproject commit 574f1dfe62380403400d3747a7dadb5e9954deb0