[depr.str.strstreams] Fix typo and inconsistent formatting.

Author: zygoloid

source/future.tex

@@ -925,6 +925,7 @@
 \tcode{strstreambuf}
 object to control the associated array object.
 For the sake of exposition, the maintained data is presented here as:
+
 \begin{itemize}
 \item
 \tcode{sb}, the \tcode{strstreambuf} object.
@@ -1168,17 +1169,16 @@
 \pnum
 The class
 \tcode{strstream}
-supports reading and writing from objects of classs
-\tcode{strstreambuf.}
+supports reading and writing from objects of class
+\tcode{strstreambuf}.
 It supplies a
 \tcode{strstreambuf}
 object to control the associated array object.
-For the sake of exposition, the maintained data is presented here as
+For the sake of exposition, the maintained data is presented here as:
+
 \begin{itemize}
 \item
-\tcode{sb}, the
-\tcode{strstreambuf}
-object.
+\tcode{sb}, the \tcode{strstreambuf} object.
 \end{itemize}
 
 \rSec3[depr.strstream.cons]{\tcode{strstream} constructors}