Fixing discrepancies between docs and implementation (#57208)

Author: lukewar

content/get-started/writing-on-github/working-with-advanced-formatting/attaching-files.md

@@ -92,7 +92,6 @@ The following file types are supported for uploads in issue comments, pull reque
 
 #### Development and code files
 
-* Binary files (`.bin`)
 * C files (`.c`)
 * C# files (`.cs`)
 * C++ files (`.cpp`)