typo

Doc/ref/refa1.tex

@@ -89,7 +89,7 @@ will be in effect in the interactive session started after the script
 is executed.
 
 \section{\module{__future__} ---
-	 Future statement definitions}
+         Future statement definitions}
 
 \declaremodule[future]{standard}{__future__}
 \modulesynopsis{Future statement definitions}
@@ -172,7 +172,7 @@ operations.  Each occurrence of a name in the program text refers to
 the binding of that name established in the innermost function block
 containing the use.
 
-A \dfn{block} is a pice of Python program text that can is executed as
+A \dfn{block} is a piece of Python program text that can is executed as
 a unit.  The following are blocks: a module, a function body, and a
 class defintion.