Remove unused former source of tensorflow.org/tutorials/image_retraining.
Remove unused former source of tensorflow.org/tutorials/image_retraining.

The source of https://tensorflow.org/tutorials/image_retraining has moved from
https://github.com/tensorflow/tensorflow/tree/master/tensorflow/docs_src/tutorials
to https://github.com/tensorflow/hub/tree/master/docs/tutorials
because of its use of TensorFlow Hub.

This change replaces the now-defunct version with a pointer to the new
location, in order to avoid dead code.

PiperOrigin-RevId: 192451570

gojira/tensorflow,Intel-tensorflow/tensorflow,renyi533/tensorflow,dendisuhubdy/tensorflow,benoitsteiner/tensorflow-xsmm,alsrgv/tensorflow,xodus7/tensorflow,kevin-coder/tensorflow-fork,tensorflow/tensorflow,gunan/tensorflow,brchiu/tensorflow,hfp/tensorflow-xsmm,aam-at/tensorflow,caisq/tensorflow,renyi533/tensorflow,chemelnucfin/tensorflow,Intel-Corporation/tensorflow,AnishShah/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow-pywrap_tf_optimizer,manipopopo/tensorflow,Bismarrck/tensorflow,jhseu/tensorflow,jbedorf/tensorflow,yongtang/tensorflow,dancingdan/tensorflow,aselle/tensorflow,asimshankar/tensorflow,caisq/tensorflow,ghchinoy/tensorflow,eaplatanios/tensorflow,frreiss/tensorflow-fred,paolodedios/tensorflow,jendap/tensorflow,kevin-coder/tensorflow-fork,sarvex/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,meteorcloudy/tensorflow,theflofly/tensorflow,seanli9jan/tensorflow,allenlavoie/tensorflow,gautam1858/tensorflow,freedomtan/tensorflow,annarev/tensorflow,frreiss/tensorflow-fred,apark263/tensorflow,dancingdan/tensorflow,AnishShah/tensorflow,dancingdan/tensorflow,yanchen036/tensorflow,alsrgv/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,brchiu/tensorflow,snnn/tensorflow,cxxgtxy/tensorflow,ageron/tensorflow,DavidNorman/tensorflow,tensorflow/tensorflow,gautam1858/tensorflow,ageron/tensorflow,dancingdan/tensorflow,girving/tensorflow,ppwwyyxx/tensorflow,hehongliang/tensorflow,DavidNorman/tensorflow,paolodedios/tensorflow,kevin-coder/tensorflow-fork,kobejean/tensorflow,Bismarrck/tensorflow,jbedorf/tensorflow,brchiu/tensorflow,kobejean/tensorflow,brchiu/tensorflow,xzturn/tensorflow,kevin-coder/tensorflow-fork,kobejean/tensorflow,davidzchen/tensorflow,dongjoon-hyun/tensorflow,benoitsteiner/tensorflow-xsmm,paolodedios/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,jalexvig/tensorflow,caisq/tensorflow,drpngx/tensorflow,jendap/tensorflow,asimshankar/tensorflow,benoitsteiner/tensorflow-xsmm,gojira/tensorflow,karllessard/tensorflow,adit-chandra/tensorflow,frreiss/tensorflow-fred,apark263/tensorflow,freedomtan/tensorflow,dongjoon-hyun/tensorflow,xzturn/tensorflow,yongtang/tensorflow,apark263/tensorflow,freedomtan/tensorflow,drpngx/tensorflow,karllessard/tensorflow,jalexvig/tensorflow,xzturn/tensorflow,hehongliang/tensorflow,ppwwyyxx/tensorflow,Intel-tensorflow/tensorflow,allenlavoie/tensorflow,AnishShah/tensorflow,jart/tensorflow,xodus7/tensorflow,yongtang/tensorflow,davidzchen/tensorflow,cxxgtxy/tensorflow,eaplatanios/tensorflow,nburn42/tensorflow,Bismarrck/tensorflow,yongtang/tensorflow,lukeiwanski/tensorflow,renyi533/tensorflow,gojira/tensorflow,hfp/tensorflow-xsmm,manipopopo/tensorflow,arborh/tensorflow,yanchen036/tensorflow,freedomtan/tensorflow,aselle/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,alshedivat/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,Intel-Corporation/tensorflow,arborh/tensorflow,snnn/tensorflow,alshedivat/tensorflow,meteorcloudy/tensorflow,allenlavoie/tensorflow,alshedivat/tensorflow,ppwwyyxx/tensorflow,theflofly/tensorflow,jart/tensorflow,DavidNorman/tensorflow,benoitsteiner/tensorflow-xsmm,davidzchen/tensorflow,gojira/tensorflow,jart/tensorflow,aldian/tensorflow,ghchinoy/tensorflow,AnishShah/tensorflow,frreiss/tensorflow-fred,dancingdan/tensorflow,meteorcloudy/tensorflow,yongtang/tensorflow,nburn42/tensorflow,Intel-Corporation/tensorflow,nburn42/tensorflow,lukeiwanski/tensorflow,freedomtan/tensorflow,theflofly/tensorflow,lukeiwanski/tensorflow,ppwwyyxx/tensorflow,ageron/tensorflow,petewarden/tensorflow,aldian/tensorflow,ghchinoy/tensorflow,jhseu/tensorflow,frreiss/tensorflow-fred,arborh/tensorflow,tensorflow/tensorflow,jalexvig/tensorflow,girving/tensorflow,xodus7/tensorflow,ghchinoy/tensorflow,karllessard/tensorflow,snnn/tensorflow,dendisuhubdy/tensorflow,chemelnucfin/tensorflow,drpngx/tensorflow,AnishShah/tensorflow,ghchinoy/tensorflow,ageron/tensorflow,brchiu/tensorflow,xodus7/tensorflow,tensorflow/tensorflow-pywrap_saved_model,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,alshedivat/tensorflow,gunan/tensorflow,jendap/tensorflow,tensorflow/tensorflow,ZhangXinNan/tensorflow,girving/tensorflow,dancingdan/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,karllessard/tensorflow,ageron/tensorflow,jhseu/tensorflow,xzturn/tensorflow,jhseu/tensorflow,ZhangXinNan/tensorflow,annarev/tensorflow,aam-at/tensorflow,theflofly/tensorflow,theflofly/tensorflow,AnishShah/tensorflow,kobejean/tensorflow,cxxgtxy/tensorflow,jbedorf/tensorflow,ghchinoy/tensorflow,Bismarrck/tensorflow,dongjoon-hyun/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,karllessard/tensorflow,chemelnucfin/tensorflow,drpngx/tensorflow,asimshankar/tensorflow,hfp/tensorflow-xsmm,ppwwyyxx/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,eaplatanios/tensorflow,AnishShah/tensorflow,lukeiwansk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in/tensorflow,kevin-coder/tensorflow-fork,arborh/tensorflow,snnn/tensorflow,aldian/tensorflow,alshedivat/tensorflow,kobejean/tensorflow,sarvex/tensorflow,chemelnucfin/tensorflow,apark263/tensorflow,petewarden/tensorflow,nburn42/tensorflow,tensorflow/tensorflow-pywrap_saved_model,jalexvig/tensorflow,jhseu/tensorflow,caisq/tensorflow,alshedivat/tensorflow,ppwwyyxx/tensorflow,renyi533/tensorflow,aselle/tensorflow,renyi533/tensorflow,petewarden/tensorflow,AnishShah/tensorflow,manipopopo/tensorflow,Intel-tensorflow/tensorflow,sarvex/tensorflow,davidzchen/tensorflow,gunan/tensorflow,frreiss/tensorflow-fred,DavidNorman/tensorflow,ZhangXinNan/tensorflow,jendap/tensorflow,aselle/tensorflow,DavidNorman/tensorflow,lukeiwanski/tensorflow,tensorflow/tensorflow-pywrap_saved_model,manipopopo/tensorflow,cxxgtxy/tensorflow,tensorflow/tensorflow,jhseu/tensorflow,dongjoon-hyun/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,ghchinoy/tensorflow,yanchen036/tensorflow,adit-chandra/tensorflow