Remove outdated x264 build info

Author: shssoichiro

encoding/codecs/x264.md

@@ -27,10 +27,6 @@ Here's how we get a copy of the x264 encoder:
 
 Official Windows builds are available
 [here](https://download.videolan.org/pub/x264/binaries/win64/).
-For these examples,
-you'll want the latest version
-of the standard 8-bit build,
-which is the version without "10b" (for 10-bit) in the name.
 
 ### Linux/macOS