Revert "Xray docs with description of Flight Data Recorder binary format."

This reverts commit 3462b8ad41a840fd54dbbd0d3f2a514c5ad6f656.

The docs-llvm-html target failed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309842 91177308-0d34-0410-b5e6-96231b3b80d8

Author: WiseMaestro

docs/XRay.rst

@@ -196,9 +196,6 @@ on your application, you may set the ``xray_fdr_log`` option to ``true`` in the
 ``XRAY_OPTIONS`` environment variable (while also optionally setting the
 ``xray_naive_log`` to ``false``).
 
-When the buffers are flushed to disk, the result is a binary trace format
-described by `XRay FDR format <XRayFDRFormat.html>`_
-
 When FDR mode is on, it will keep writing and recycling memory buffers until
 the logging implementation is finalized -- at which point it can be flushed and
 re-initialised later. To do this programmatically, we follow the workflow