message: [XLA] Fix the docs of dumping flag
  Patch from adapted from
diff: @@ -109,8 +109,7 @@ programs. To dump the generated programs, use the environment variable
  `XLA_FLAGS`:
  ```
  -$ XLA_FLAGS="--dump_hlo_as_text --xla_dump_to=/tmp/generated"
  -TF_XLA_FLAGS="--tf_xla_auto_jit=2" my/tensorflow/program
  +$ XLA_FLAGS="--xla_dump_to=/tmp/generated" TF_XLA_FLAGS="--tf_xla_auto_jit=2" my/tensorflow/program
  ```
  After the dumping is performed, you can find the following files in
  