Update tf.stack description.
Update tf.stack description.

PiperOrigin-RevId: 270163239

DavidNorman/tensorflow,adit-chandra/tensorflow,jhseu/tensorflow,tensorflow/tensorflow,davidzchen/tensorflow,arborh/tensorflow,annarev/tensorflow,tensorflow/tensorflow,adit-chandra/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,karllessard/tensorflow,freedomtan/tensorflow,davidzchen/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,renyi533/tensorflow,xzturn/tensorflow,jhseu/tensorflow,sarvex/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,arborh/tensorflow,tensorflow/tensorflow,renyi533/tensorflow,renyi533/tensorflow,frreiss/tensorflow-fred,adit-chandra/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gunan/tensorflow,renyi533/tensorflow,DavidNorman/tensorflow,tensorflow/tensorflow,Intel-tensorflow/tensorflow,renyi533/tensorflow,adit-chandra/tensorflow,Intel-Corporation/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,petewarden/tensorflow,davidzchen/tensorflow,Intel-tensorflow/tensorflow,DavidNorman/tensorflow,freedomtan/tensorflow,karllessard/tensorflow,xzturn/tensorflow,Intel-Corporation/tensorflow,gunan/tensorflow,Intel-tensorflow/tensorflow,gautam1858/tensorflow,DavidNorman/tensorflow,Intel-Corporation/tensorflow,ppwwyyxx/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,Intel-Corporation/tensorflow,aldian/tensorflow,DavidNorman/tensorflow,arborh/tensorflow,frreiss/tensorflow-fred,sarvex/tensorflow,xzturn/tensorflow,annarev/tensorflow,tensorflow/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aldian/tensorflow,yongtang/tensorflow,paolodedios/tensorflow,gunan/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,gunan/tensorflow,davidzchen/tensorflow,karllessard/tensorflow,renyi533/tensorflow,karllessard/tensorflow,DavidNorman/tensorflow,freedomtan/tensorflow,xzturn/tensorflow,petewarden/tensorflow,petewarden/tensorflow,adit-chandra/tensorflow,aldian/tensorflow,DavidNorman/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,petewarden/tensorflow,adit-chandra/tensorflow,frreiss/tensorflow-fred,gunan/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,cxxgtxy/tensorflow,yongtang/tensorflow,sarvex/tensorflow,karllessard/tensorflow,renyi533/tensorflow,Intel-tensorflow/tensorflow,davidzchen/tensorflow,gunan/tensorflow,aam-at/tensorflow,adit-chandra/tensorflow,arborh/tensorflow,jhseu/tensorflow,sarvex/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,arborh/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,davidzchen/tensorflow,arborh/tensorflow,jhseu/tensorflow,gunan/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-experimental_link_static_libraries_once,adit-chandra/tensorflow,petewarden/tensorflow,aam-at/tensorflow,Intel-tensorflow/tensorflow,arborh/tensorflow,petewarden/tensorflow,jhseu/tensorflow,aam-at/tensorflow,karllessard/tensorflow,aam-at/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,jhseu/tensorflow,jhseu/tensorflow,arborh/tensorflow,gautam1858/tensorflow,ppwwyyxx/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gunan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aldian/tensorflow,ppwwyyxx/tensorflow,davidzchen/tensorflow,frreiss/tensorflow-fred,gunan/tensorflow,davidzchen/tensorflow,aam-at/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,adit-chandra/tensorflow,annarev/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,freedomtan/tensorflow,paolodedios/tensorflow,freedomtan/tensorflow,freedomtan/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,xzturn/tensorflow,jhseu/tensorflow,aldian/tensorflow,xzturn/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,jhseu/tensorflow,arborh/tensorflow,tensorflow/tensorflow,annarev/tensorflow,arborh/tensorflow,tensorflow/tensorflow,annarev/tensorflow,gautam1858/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,sarvex/tensorflow,cxxgtxy/tensorflow,frreiss/tensorflow-fred,renyi533/tensorflow,yongtang/tensorflow,DavidNorman/tensorflow,davidzchen/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,arborh/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,annarev/tensorflow,cxxgtxy/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,annarev/tensorflow,yongtang/tensorflow,xzturn/tensorflow,gunan/tensorflow,ppwwyyxx/tensorflow,gunan/tensorflow,aldian/tensorflow,jhseu/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,petewarden/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,arborh/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,xzturn/tensorflow,cxxgtxy/tensorflow,cxxgtxy/tensorflow,annarev/tensorflow,aam-at/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,aldian/tensorflow,yongtang/tensorflow,DavidNorman/tensorflow,jhseu/tensorflow,karllessard/tensorflow,DavidNorman/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,petewarden/tensorflow,paolodedios/tensorflow,renyi533/tensorflow,davidzchen/tensorflow,Intel-tensorflow/tensorflow,aam-at/tensorflow,renyi533/tensorflow,gunan/tensorflow,Intel-Corporation/tensorflow,aam-at/tensorflow,frreiss/tensorflow-fred,aam-at/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,cxxgtxy/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,xzturn/tensorflow,DavidNorman/tensorflow,aldian/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,sarvex/tensorflow,adit-chandra/tensorflow,annarev/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,frreiss/tensorflow-fred,ppwwyyxx/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,sarvex/tensorflow,cxxgtxy/tensorflow,DavidNorman/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ppwwyyxx/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,renyi533/tensorflow,karllessard/tensorflow,frreiss/tensorflow-fred,adit-chandra/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,ppwwyyxx/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer