[input.streams.general],[output.streams.general] describe contents more accurately

Class templates are not types. Function templates are not function signatures.

Author: jwakely

source/iostreams.tex

@@ -4212,8 +4212,9 @@
 \rSec3[input.streams.general]{General}
 
 \pnum
-The header \libheader{istream} defines two types
-and a function signature that control input from a stream buffer along with a function template that extracts from stream rvalues.
+The header \libheader{istream} defines two class templates
+and a function template that control input from a stream buffer,
+along with a function template that extracts from stream rvalues.
 
 \rSec3[istream]{Class template \tcode{basic_istream}}
 
@@ -5811,9 +5812,9 @@
 \rSec3[output.streams.general]{General}
 
 \pnum
-The header \libheader{ostream} defines a type
-and several function signatures that control output to a
-stream buffer along with a function template that inserts into stream rvalues.
+The header \libheader{ostream} defines a class template
+and several function templates that control output to a stream buffer,
+along with a function template that inserts into stream rvalues.
 
 \rSec3[ostream]{Class template \tcode{basic_ostream}}