Fix typos in packed attribute documentation

	* doc/extend.texi (Common Type Attributes): Fix typos.

From-SVN: r266267

gcc/ChangeLog

+2018-11-19  Jonathan Wakely  <jwakely@redhat.com>
+
+	* doc/extend.texi (Common Type Attributes): Fix typos.
+
 2018-11-19  Martin Liska  <mliska@suse.cz>
 
 	PR gcov-profile/88045

gcc/doc/extend.texi

@@ -7317,7 +7317,7 @@ or @code{__pointer__} for the mode used to represent pointers.
 
 @item packed
 @cindex @code{packed} type attribute
-This attribute, attached to @code{struct}, @code{union}, or C++ @code{class}
+This attribute, attached to a @code{struct}, @code{union}, or C++ @code{class}
 type definition, specifies that each of its members (other than zero-width
 bit-fields) is placed to minimize the memory required.  This is equivalent
 to specifying the @code{packed} attribute on each of the members.
@@ -7349,7 +7349,7 @@ struct __attribute__ ((__packed__)) my_packed_struct
   @};
 @end smallexample
 
-You may only specify the @code{packed} attribute attribute on the definition
+You may only specify the @code{packed} attribute on the definition
 of an @code{enum}, @code{struct}, @code{union}, or @code{class}, 
 not on a @code{typedef} that does not also define the enumerated type,
 structure, union, or class.