remove fork example (#232)

[ROCm/rocdecode commit: 072d6fe0e2]

projects/rocdecode/docs/sphinx/_toc.yml.in

@@ -25,7 +25,6 @@ subtrees:
         subtrees:
           - entries:
             - file: videoDecode
-            - file: videoDecodeFork
             - file: videoDecodeMem
             - file: videoDecodeMultiFiles
             - file: videoDecodePerf