Patch #849350: Update to document bool return values. Backported to 2.3.

Doc/lib/libdoctest.tex

@@ -411,7 +411,7 @@ is vulnerable!  One workaround is to do
 
 \begin{verbatim}
 >>> foo() == {"Hermione": "hippogryph", "Harry": "broomstick"}
-1
+True
 >>>
 \end{verbatim}
 

Doc/lib/liboperator.tex

@@ -249,7 +249,7 @@ measure of reliability with instance objects.  For example:}
 >>> import operator
 >>> o = C()
 >>> operator.isMappingType(o)
-1
+True
 \end{verbatim}
 
 \begin{funcdesc}{isCallable}{o}

Doc/lib/libpprint.tex

@@ -111,7 +111,7 @@ recursive objects.
 
 \begin{verbatim}
 >>> pprint.isreadable(stuff)
-0
+False
 \end{verbatim}
 \end{funcdesc}
 

Doc/lib/libweakref.tex

@@ -186,7 +186,7 @@ referent to be obtained, if it still exists, by calling it:
 >>> r = weakref.ref(o)
 >>> o2 = r()
 >>> o is o2
-1
+True
 \end{verbatim}
 
 If the referent no longer exists, calling the reference object returns