parakeet : remove flash attn options from README.md [no ci]

Commit 9164f9c ("parakeet : remove
flash attention param) removed the flash attention options but I forgot
to remote them from the readme.

Author: danbev

examples/parakeet-cli/README.md

@@ -30,8 +30,6 @@ options:
   -f,     --file FILE         [       ] input audio file
   -ng,    --no-gpu            [false  ] disable GPU
   -dev N, --device N          [0      ] GPU device to use
-  -fa,    --flash-attn        [false  ] enable flash attention
-  -nfa,   --no-flash-attn     [false  ] disable flash attention
   -ps,    --print-segments    [false  ] print segment information
 ```