doc: remove the reference to supporting AviSynth 2.5

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

doc/general.texi

@@ -179,7 +179,7 @@ included in compat/avisynth/, which allows the user to enable support
 without needing to search for these headers themselves.
 
 For Windows, supported AviSynth variants are
-@url{http://avisynth.nl, AviSynth 2.5 or 2.6} for 32-bit builds and
+@url{http://avisynth.nl, AviSynth 2.6} for 32-bit builds and
 @url{http://avs-plus.net, AviSynth+ 0.1} for 32-bit and 64-bit builds.
 
 For Linux and OS X, the supported AviSynth variant is