doc/filters: fix option name for mix filter

Corrected from nb_inputs to inputs

diff --git a/doc/filters.texi b/doc/filters.texi
index 621b5f7ebc94b77fc6dae77e010452f89bc86204..7599646a5e03f9e22f6d7d77ea40cff5b7016264 100644 (file)
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -14795,7 +14795,7 @@ Mix several video input streams into one video stream.
 A description of the accepted options follows.
 
 @table @option
-@item nb_inputs
+@item inputs
 The number of inputs. If unspecified, it defaults to 2.
 
 @item weights