Prefer "foo" over ``foo'' in the ffprobe docs.

Originally committed as revision 25055 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/ffprobe-doc.texi

@@ -50,8 +50,8 @@ keyN=valN
 @end example
 
 Metadata tags stored in the container or in the streams are recognized
-and printed in the corresponding ``FORMAT'' or ``STREAM'' section, and
-are prefixed by the string ``TAG:''.
+and printed in the corresponding "FORMAT" or "STREAM" section, and
+are prefixed by the string "TAG:".
 
 @c man end
 
@@ -75,7 +75,7 @@ Show the unit of the displayed values.
 
 @item -prefix
 Show a SI prefixes of the displayed values.
-Unless ``-byte_binary_prefix'' option is used all the prefix
+Unless "-byte_binary_prefix" option is used all the prefix
 are decimal.
 
 @item -byte_binary_prefix
@@ -86,28 +86,28 @@ Use sexagesimal format HH:MM:SS.MICROSECONDS for time values.
 
 @item -pretty
 Prettify the format of the displayed values, it corresponds to the
-options ``-unit -prefix -byte_binary_prefix -sexagesimal''.
+options "-unit -prefix -byte_binary_prefix -sexagesimal".
 
 @item -show_format
 Show information about the container format of the input multimedia
 stream.
 
 All the container format information is printed within a section with
-name ``FORMAT''.
+name "FORMAT".
 
 @item -show_packets
 Show information about each packet contained in the input multimedia
 stream.
 
 The information for each single packet is printed within a dedicated
-section with name ``PACKET''.
+section with name "PACKET".
 
 @item -show_streams
 Show information about each media stream contained in the input
 multimedia stream.
 
 Each media stream information is printed within a dedicated section
-with name ``STREAM''.
+with name "STREAM".
 
 @end table
 @c man end