Clarified docs of Lambda function on usecase
Clarified docs of Lambda function on usecase

Felt a bit unclear about the usecase between `Lambda` and subclassing. Tried to clear that up.
arborh/tensorflow,arborh/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,adit-chandra/tensorflow,jhseu/tensorflow,yongtang/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,DavidNorman/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,gunan/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,xzturn/tensorflow,aam-at/tensorflow,renyi533/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,jhseu/tensorflow,arborh/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,karllessard/tensorflow,petewarden/tensorflow,xzturn/tensorflow,annarev/tensorflow,petewarden/tensorflow,Intel-Corporation/tensorflow,renyi533/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,ppwwyyxx/tensorflow,gunan/tensorflow,davidzchen/tensorflow,aldian/tensorflow,gunan/tensorflow,arborh/tensorflow,tensorflow/tensorflow-pywrap_saved_model,yongtang/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,annarev/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,adit-chandra/tensorflow,frreiss/tensorflow-fred,xzturn/tensorflow,renyi533/tensorflow,tensorflow/tensorflow,aam-at/tensorflow,cxxgtxy/tensorflow,aam-at/tensorflow,xzturn/tensorflow,karllessard/tensorflow,renyi533/tensorflow,arborh/tensorflow,Intel-Corporation/tensorflow,davidzchen/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,gautam1858/tensorflow,aldian/tensorflow,jhseu/tensorflow,DavidNorman/tensorflow,adit-chandra/tensorflow,arborh/tensorflow,petewarden/tensorflow,gautam1858/tensorflow,petewarden/tensorflow,xzturn/tensorflow,xzturn/tensorflow,yongtang/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,paolodedios/tensorflow,annarev/tensorflow,DavidNorman/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,aldian/tensorflow,xzturn/tensorflow,renyi533/tensorflow,petewarden/tensorflow,adit-chandra/tensorflow,aldian/tensorflow,gunan/tensorflow,sarvex/tensorflow,arborh/tensorflow,jhseu/tensorflow,tensorflow/tensorflow,frreiss/tensorflow-fred,DavidNorman/tensorflow,yongtang/tensorflow,karllessard/tensorflow,sarvex/tensorflow,annarev/tensorflow,ppwwyyxx/tensorflow,karllessard/tensorflow,petewarden/tensorflow,aam-at/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,xzturn/tensorflow,sarvex/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,frreiss/tensorflow-fred,petewarden/tensorflow,annarev/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,DavidNorman/tensorflow,Intel-tensorflow/tensorflow,sarvex/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,aldian/tensorflow,DavidNorman/tensorflow,karllessard/tensorflow,adit-chandra/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,karllessard/tensorflow,annarev/tensorflow,freedomtan/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,renyi533/tensorflow,paolodedios/tensorflow,davidzchen/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,davidzchen/tensorflow,ppwwyyxx/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,renyi533/tensorflow,DavidNorman/tensorflow,gautam1858/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,xzturn/tensorflow,jhseu/tensorflow,paolodedios/tensorflow,renyi533/tensorflow,xzturn/tensorflow,arborh/tensorflow,davidzchen/tensorflow,annarev/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,DavidNorman/tensorflow,tensorflow/tensorflow,jhseu/tensorflow,davidzchen/tensorflow,jhseu/tensorflow,aam-at/tensorflow,gunan/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,yongtang/tensorflow,aam-at/tensorflow,Intel-Corporation/tensorflow,gunan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,jhseu/tensorflow,freedomtan/tensorflow,DavidNorman/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,freedomtan/tensorflow,adit-chandra/tensorflow,ppwwyyxx/tensorflow,sarvex/tensorflow,petewarden/tensorflow,petewarden/tensorflow,aam-at/tensorflow,gunan/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow,DavidNorman/tensorflow,renyi533/tensorflow,annarev/tensorflow,cxxgtxy/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,aam-at/tensorflow,Intel-Corporation/tensorflow,jhseu/tensorflow,aldian/tensorflow,cxxgtxy/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,arborh/tensorflow,tensorflow/tensorflow,ppwwyyxx/tensorflow,Intel-Corporation/tensorflow,tensorflow/tensorflow-pywrap_saved_model,DavidNorman/tensorflow,gunan/tensorflow,arborh/tensorflow,karllessard/tensorflow,davidzchen/tensorflow,adit-chandra/tensorflow,adit-chandra/tensorflow,xzturn/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,paolodedios/tensorflow,frreiss/tensorflow-fred,gautam1858/tensorflow,arborh/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,Intel-Corporation/tensorflow,aldian/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gunan/tensorflow,gunan/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,gautam1858/tensorflow,ppwwyyxx/tensorflow,davidzchen/tensorflow,gautam1858/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_saved_model,renyi533/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,ppwwyyxx/tensorflow,renyi533/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,renyi533/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,jhseu/tensorflow,DavidNorman/tensorflow,yongtang/tensorflow,paolodedios/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,sarvex/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gunan/tensorflow,adit-chandra/tensorflow,aam-at/tensorflow,cxxgtxy/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,arborh/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,gunan/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,frreiss/tensorflow-fred,paolodedios/tensorflow,xzturn/tensorflow,annarev/tensorflow,cxxgtxy/tensorflow,aldian/tensorflow,aam-at/tensorflow,adit-chandra/tensorflow,Intel-tensorflow/tensorflow