[basic.ios.members] Add period at end of "Returns"

Author: Andreas-Krug

source/iostreams.tex

@@ -2052,7 +2052,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{use_facet<ctype<char_type>>(getloc()).narrow(c, dfault)}
+\tcode{use_facet<ctype<char_type>>(getloc()).narrow(c, dfault)}.
 \end{itemdescr}
 
 \indexlibrarymember{widen}{basic_ios}%
@@ -2063,7 +2063,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{use_facet<ctype<char_type>>(getloc()).widen(c)}
+\tcode{use_facet<ctype<char_type>>(getloc()).widen(c)}.
 \end{itemdescr}
 
 \indexlibrarymember{fill}{basic_ios}%