copyright.tex: Add 1995 to copyright message.
lib.tex: add libimp; remove bogus warning about lineii.
libmath.tex: document hypot().
libmd5.tex: rename md5.md5() to md5.new().
libposix.tex: document chown().
libposixfile.tex: openfile() instead of fileopen().
libsocket.tex: document gethostbyaddr().
libtypes.tex: add footnote explaining why readline() keeps the newline.
ref3.tex: correct typos, add back*quotes to index.
ref4.tex: don't use \verb inside footnote.
ref5.tex: explain repr() and str() and add them + back*quotes to index.
ref6.tex: correct typo, don't use \verb in footnote.
ref7.tex: don't use \verb in footnote.
diff --git a/Doc/ref/ref3.tex b/Doc/ref/ref3.tex
index 8d327e0..67848bb 100644
--- a/Doc/ref/ref3.tex
+++ b/Doc/ref/ref3.tex
@@ -470,7 +470,7 @@
\verb@open()@ built-in function, and also by \verb@posix.popen()@ and
the \verb@makefile@ method of socket objects. \verb@sys.stdin@,
\verb@sys.stdout@ and \verb@sys.stderr@ are file objects corresponding
-the the interpreter's standard input, output and error streams.
+to the interpreter's standard input, output and error streams.
See the Python Library Reference for methods of file objects and other
details.
\obindex{file}
@@ -498,7 +498,7 @@
Code objects represent executable code. The difference between a code
object and a function object is that the function object contains an
explicit reference to the function's context (the module in which it
-was defined) which a code object contains no context. There is no way
+was defined) while a code object contains no context. There is no way
to execute a bare code object.
\obindex{code}
@@ -622,8 +622,12 @@
\code{x,__del__} is only called when its reference count reaches zero.
\item[\tt __repr__(self)]
-Called by the \verb@repr()@ built-in function and by conversions
-(reverse quotes) to compute the string representation of an object.
+Called by the \verb@repr()@ built-in function and by string conversions
+(reverse or backward quotes) to compute the string representation of an object.
+\indexii{string}{conversion}
+\indexii{reverse}{quotes}
+\indexii{backward}{quotes}
+\index{back-quotes}
\item[\tt __str__(self)]
Called by the \verb@str()@ built-in function and by the \verb@print@