Update mixed precision release notes.
Update mixed precision release notes.

PiperOrigin-RevId: 338523456
Change-Id: I601170a3aa65cd053c70c8956882c4da2776905c

tensorflow/tensorflow-pywrap_tf_optimizer,frreiss/tensorflow-fred,aam-at/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,freedomtan/tensorflow,sarvex/tensorflow,sarvex/tensorflow,paolodedios/tensorflow,karllessard/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aam-at/tensorflow,sarvex/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,annarev/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,sarvex/tensorflow,petewarden/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,annarev/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,annarev/tensorflow,petewarden/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,annarev/tensorflow,tensorflow/tensorflow-pywrap_saved_model,karllessard/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,petewarden/tensorflow,aam-at/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,gautam1858/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,cxxgtxy/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,yongtang/tensorflow,annarev/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,cxxgtxy/tensorflow,petewarden/tensorflow,aam-at/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,aam-at/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,frreiss/tensorflow-fred,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-Corporation/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,tensorflow/tensorflow,cxxgtxy/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,cxxgtxy/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,tensorflow/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,yongtang/tensorflow,annarev/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,Intel-tensorflow/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,aam-at/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,frreiss/tensorflow-fred,frreiss/tensorflow-fred,karllessard/tensorflow,cxxgtxy/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,annarev/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,sarvex/tensorflow,annarev/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,tensorflow/tensorflow,freedomtan/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,annarev/tensorflow,Intel-Corporation/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,cxxgtxy/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,yongtang/tensorflow,frreiss/tensorflow-fred,freedomtan/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-pywrap_saved_model,paolodedios/tensorflow,cxxgtxy/tensorflow,Intel-Corporation/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow