Lots of minor fixes, many suggested by Detlef Lannert

<lannert@uni-duesseldorf.de>.

Doc/ref/ref6.tex

@@ -266,11 +266,11 @@ target:          identifier | "(" target_list ")" | "[" target_list "]"
 (See section \ref{primaries} for the syntax definitions for the last
 three symbols.)
 
-An augmented assignment evaluates the target (which, unlike with normal
-assignment statements, cannot be a tuple) and the expression list, performs
-the binary operation specific to the type of assignment on the two operands,
-and assigns the result to the original target. The target is only evaluated
-once.
+An augmented assignment evaluates the target (which, unlike normal
+assignment statements, cannot be an unpacking) and the expression
+list, performs the binary operation specific to the type of assignment
+on the two operands, and assigns the result to the original
+target.  The target is only evaluated once.
 
 An augmented assignment expression like \code{x += 1} can be rewritten as
 \code{x = x + 1} to achieve a similar, but not exactly equal effect. In the
@@ -370,9 +370,10 @@ exception is raised.
 \exindex{RuntimeError}
 
 \keyword{print} also has an extended form, defined as
+\index{extended print statement}
 
 \begin{verbatim}
-print_stmt: '>>' expression [ (',' expression)+ [','] ] )
+print_stmt: "print" ">>" expression [ ("," expression)+ [","] ]
 \end{verbatim}
 
 In this form, the first expression after the \keyword{>>} must
@@ -559,7 +560,7 @@ see below.
 The \keyword{from} form does not bind the module name: it goes through the
 list of identifiers, looks each one of them up in the module found in step
 (1), and binds the name in the local namespace to the object thus found. 
-Like with the first form of \keyword{import}, an alternate local name can be
+As with the first form of \keyword{import}, an alternate local name can be
 supplied by specifying "\keyword{as} localname".  If a name is not found,
 \exception{ImportError} is raised.  If the list of identifiers is replaced
 by a star (\samp{*}), all names defined in the module are bound, except