STYLE: Add more detail to the vxl update instructions
STYLE: Add more detail to the vxl update instructions

State explicitly that the upstream extraction script should be run in an
outside tree and the results moved into the temporary directory for
commit of a new upstream snapshot.

Change-Id: I1a9742a9154c8d45bb7bb530cd16e42687268a43

LucHermitte/ITK,biotrump/ITK,blowekamp/ITK,hendradarwin/ITK,PlutoniumHeart/ITK,hjmjohnson/ITK,jmerkow/ITK,BRAINSia/ITK,spinicist/ITK,Kitware/ITK,malaterre/ITK,BlueBrain/ITK,blowekamp/ITK,jmerkow/ITK,fbudin69500/ITK,jcfr/ITK,spinicist/ITK,hendradarwin/ITK,biotrump/ITK,hinerm/ITK,blowekamp/ITK,zachary-williamson/ITK,heimdali/ITK,stnava/ITK,jmerkow/ITK,richardbeare/ITK,fedral/ITK,vfonov/ITK,vfonov/ITK,msmolens/ITK,LucasGandel/ITK,BRAINSia/ITK,biotrump/ITK,hendradarwin/ITK,fedral/ITK,spinicist/ITK,eile/ITK,malaterre/ITK,hjmjohnson/ITK,PlutoniumHeart/ITK,eile/ITK,vfonov/ITK,GEHC-Surgery/ITK,PlutoniumHeart/ITK,msmolens/ITK,BRAINSia/ITK,jmerkow/ITK,thewtex/ITK,ajjl/ITK,PlutoniumHeart/ITK,stnava/ITK,spinicist/ITK,BlueBrain/ITK,atsnyder/ITK,Kitware/ITK,msmolens/ITK,biotrump/ITK,hinerm/ITK,fedral/ITK,zachary-williamson/ITK,jcfr/ITK,BlueBrain/ITK,hjmjohnson/ITK,atsnyder/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,jcfr/ITK,stnava/ITK,vfonov/ITK,ajjl/ITK,malaterre/ITK,BlueBrain/ITK,biotrump/ITK,fedral/ITK,fedral/ITK,malaterre/ITK,LucHermitte/ITK,fedral/ITK,thewtex/ITK,eile/ITK,malaterre/ITK,hinerm/ITK,jmerkow/ITK,thewtex/ITK,atsnyder/ITK,malaterre/ITK,ajjl/ITK,richardbeare/ITK,thewtex/ITK,GEHC-Surgery/ITK,LucasGandel/ITK,GEHC-Surgery/ITK,fedral/ITK,atsnyder/ITK,eile/ITK,vfonov/ITK,InsightSoftwareConsortium/ITK,BlueBrain/ITK,blowekamp/ITK,stnava/ITK,eile/ITK,BlueBrain/ITK,fbudin69500/ITK,InsightSoftwareConsortium/ITK,richardbeare/ITK,LucasGandel/ITK,LucasGandel/ITK,hendradarwin/ITK,malaterre/ITK,GEHC-Surgery/ITK,stnava/ITK,PlutoniumHeart/ITK,hinerm/ITK,ajjl/ITK,BRAINSia/ITK,thewtex/ITK,richardbeare/ITK,stnava/ITK,jmerkow/ITK,PlutoniumHeart/ITK,zachary-williamson/ITK,spinicist/ITK,blowekamp/ITK,stnava/ITK,Kitware/ITK,fbudin69500/ITK,hinerm/ITK,vfonov/ITK,hendradarwin/ITK,Kitware/ITK,msmolens/ITK,ajjl/ITK,heimdali/ITK,fbudin69500/ITK,blowekamp/ITK,blowekamp/ITK,PlutoniumHeart/ITK,hjmjohnson/ITK,vfonov/ITK,LucHermitte/ITK,GEHC-Surgery/ITK,richardbeare/ITK,vfonov/ITK,ajjl/ITK,InsightSoftwareConsortium/ITK,ajjl/ITK,zachary-williamson/ITK,heimdali/ITK,msmolens/ITK,richardbeare/ITK,Kitware/ITK,hinerm/ITK,GEHC-Surgery/ITK,heimdali/ITK,fbudin69500/ITK,msmolens/ITK,LucasGandel/ITK,zachary-williamson/ITK,GEHC-Surgery/ITK,eile/ITK,thewtex/ITK,spinicist/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,zachary-williamson/ITK,BlueBrain/ITK,LucHermitte/ITK,spinicist/ITK,atsnyder/ITK,zachary-williamson/ITK,LucHermitte/ITK,eile/ITK,atsnyder/ITK,vfonov/ITK,Kitware/ITK,LucHermitte/ITK,ajjl/ITK,fbudin69500/ITK,fbudin69500/ITK,hinerm/ITK,hjmjohnson/ITK,malaterre/ITK,BlueBrain/ITK,jcfr/ITK,LucHermitte/ITK,GEHC-Surgery/ITK,heimdali/ITK,heimdali/ITK,msmolens/ITK,atsnyder/ITK,eile/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,zachary-williamson/ITK,biotrump/ITK,hjmjohnson/ITK,fedral/ITK,jmerkow/ITK,hinerm/ITK,thewtex/ITK,atsnyder/ITK,jmerkow/ITK,heimdali/ITK,richardbeare/ITK,stnava/ITK,BRAINSia/ITK,msmolens/ITK,LucasGandel/ITK,jcfr/ITK,biotrump/ITK,fbudin69500/ITK,hinerm/ITK,stnava/ITK,atsnyder/ITK,blowekamp/ITK,LucasGandel/ITK,eile/ITK,jcfr/ITK,PlutoniumHeart/ITK,biotrump/ITK,spinicist/ITK,LucasGandel/ITK,LucHermitte/ITK,hendradarwin/ITK,jcfr/ITK,hendradarwin/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,zachary-williamson/ITK,heimdali/ITK,hendradarwin/ITK,malaterre/ITK,jcfr/ITK