[XLA] Custom-call documentation fixes.
[XLA] Custom-call documentation fixes.

Fix some formatting and some misstatements.

PiperOrigin-RevId: 247700605

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