Redefine sameq

I think the documentation of sameq is causing confusion and misuse of
this option.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/ffmpeg.texi

@@ -281,7 +281,7 @@ Set video buffer verifier buffer size (in bits).
 Force video codec to @var{codec}. Use the @code{copy} special value to
 tell that the raw codec data must be copied as is.
 @item -sameq
-Use same video quality as source (implies VBR).
+Use same quantizer as source (implies VBR).
 
 @item -pass @var{n}
 Select the pass number (1 or 2). It is used to do two-pass

ffmpeg.c

@@ -4335,7 +4335,7 @@ static const OptionDef options[] = {
     { "vcodec", HAS_ARG | OPT_VIDEO, {(void*)opt_video_codec}, "force video codec ('copy' to copy stream)", "codec" },
     { "me_threshold", HAS_ARG | OPT_FUNC2 | OPT_EXPERT | OPT_VIDEO, {(void*)opt_me_threshold}, "motion estimaton threshold",  "threshold" },
     { "sameq", OPT_BOOL | OPT_VIDEO, {(void*)&same_quality},
-      "use same video quality as source (implies VBR)" },
+      "use same quantizer as source (implies VBR)" },
     { "pass", HAS_ARG | OPT_VIDEO, {(void*)&opt_pass}, "select the pass number (1 or 2)", "n" },
     { "passlogfile", HAS_ARG | OPT_STRING | OPT_VIDEO, {(void*)&pass_logfilename_prefix}, "select two pass log file name prefix", "prefix" },
     { "deinterlace", OPT_BOOL | OPT_EXPERT | OPT_VIDEO, {(void*)&do_deinterlace},