Correct misspellings.

Doc/lib/libdecimal.tex

@@ -1180,7 +1180,7 @@ have the same value at various precisions. Is there a way to transform them to
 a single recognizable canonical value?
 
 A.  The \method{normalize()} method maps all equivalent values to a single
-representive:
+representative:
 
 \begin{verbatim}
 >>> values = map(Decimal, '200 200.000 2E2 .02E+4'.split())

Doc/lib/libhashlib.tex

@@ -15,7 +15,7 @@ This module implements a common interface to many different secure hash and
 message digest algorithms.  Included are the FIPS secure hash algorithms SHA1,
 SHA224, SHA256, SHA384, and SHA512 (defined in FIPS 180-2) as well as RSA's MD5
 algorithm (defined in Internet \rfc{1321}).
-The terms secure hash and message digest are interchangable.  Older
+The terms secure hash and message digest are interchangeable.  Older
 algorithms were called message digests.  The modern term is secure hash.
 
 \warning{Some algorithms have known hash collision weaknesses, see the FAQ at the end.}

Doc/lib/libpipes.tex

@@ -8,7 +8,7 @@
 
 
 The \module{pipes} module defines a class to abstract the concept of
-a \emph{pipeline} --- a sequence of convertors from one file to 
+a \emph{pipeline} --- a sequence of converters from one file to 
 another.
 
 Because the module uses \program{/bin/sh} command lines, a \POSIX{} or

Doc/lib/tkinter.tex

@@ -476,7 +476,7 @@ Tk man pages for the widget in question.
 Note that the man pages list "STANDARD OPTIONS" and "WIDGET SPECIFIC
 OPTIONS" for each widget.  The former is a list of options that are
 common to many widgets, the latter are the options that are
-ideosyncratic to that particular widget.  The Standard Options are
+idiosyncratic to that particular widget.  The Standard Options are
 documented on the \manpage{options}{3} man page.
 
 No distinction between standard and widget-specific options is made in