Small grammatical touchups:

	Para. 1:  ...that reads and writes a string buffer...
			      ^		 ^

	Para. 3:  ...can be called at any time to retrieve the...
				  XXXXXXXXXXXX       ^^^^^
		  ...entire contents of the entire ``file'' ...
		     ^^^^^^^		   XXXXXXX

Guido, I hope I'm not stomping too far afield, but these seem pretty clear
to me.

Doc/lib/libstrio.tex

@@ -3,12 +3,12 @@
 \stmodindex{StringIO}
 
 This module implements a file-like class, \code{StringIO},
-that read and write a string buffer (also known as {\em memory
+that reads and writes a string buffer (also known as {\em memory
 files}). See the description on file objects for operations.
 
 When a \code{StringIO} object is created, it can be initialized
 to an existing string by passing the string to the constructor.
 If no string is given, the \code{StringIO} will start empty.
 
-The method \code{getvalue()} can be called at any time to return the
-contents of the entire ``file'' at any time.
+The method \code{getvalue()} can be called to retrieve the
+entire contents of the ``file'' at any time.

Doc/libstrio.tex

@@ -3,12 +3,12 @@
 \stmodindex{StringIO}
 
 This module implements a file-like class, \code{StringIO},
-that read and write a string buffer (also known as {\em memory
+that reads and writes a string buffer (also known as {\em memory
 files}). See the description on file objects for operations.
 
 When a \code{StringIO} object is created, it can be initialized
 to an existing string by passing the string to the constructor.
 If no string is given, the \code{StringIO} will start empty.
 
-The method \code{getvalue()} can be called at any time to return the
-contents of the entire ``file'' at any time.
+The method \code{getvalue()} can be called to retrieve the
+entire contents of the ``file'' at any time.