Update box builder docstrings, adding reference to what the box represents.
Update box builder docstrings, adding reference to what the box represents.

azjps/bokeh,bokeh/bokeh,justacec/bokeh,azjps/bokeh,justacec/bokeh,DuCorey/bokeh,clairetang6/bokeh,draperjames/bokeh,jakirkham/bokeh,bokeh/bokeh,clairetang6/bokeh,percyfal/bokeh,phobson/bokeh,aiguofer/bokeh,msarahan/bokeh,draperjames/bokeh,schoolie/bokeh,stonebig/bokeh,draperjames/bokeh,quasiben/bokeh,schoolie/bokeh,mindriot101/bokeh,dennisobrien/bokeh,Karel-van-de-Plassche/bokeh,phobson/bokeh,jakirkham/bokeh,azjps/bokeh,ericmjl/bokeh,percyfal/bokeh,clairetang6/bokeh,stonebig/bokeh,timsnyder/bokeh,aavanian/bokeh,mindriot101/bokeh,bokeh/bokeh,philippjfr/bokeh,timsnyder/bokeh,timsnyder/bokeh,draperjames/bokeh,DuCorey/bokeh,stonebig/bokeh,percyfal/bokeh,stonebig/bokeh,jakirkham/bokeh,clairetang6/bokeh,justacec/bokeh,msarahan/bokeh,Karel-van-de-Plassche/bokeh,timsnyder/bokeh,schoolie/bokeh,Karel-van-de-Plassche/bokeh,ericmjl/bokeh,KasperPRasmussen/bokeh,aavanian/bokeh,ptitjano/bokeh,percyfal/bokeh,Karel-van-de-Plassche/bokeh,rs2/bokeh,ericmjl/bokeh,bokeh/bokeh,draperjames/bokeh,aiguofer/bokeh,rs2/bokeh,mindriot101/bokeh,timsnyder/bokeh,DuCorey/bokeh,aiguofer/bokeh,aiguofer/bokeh,philippjfr/bokeh,dennisobrien/bokeh,KasperPRasmussen/bokeh,ptitjano/bokeh,ptitjano/bokeh,bokeh/bokeh,KasperPRasmussen/bokeh,KasperPRasmussen/bokeh,aavanian/bokeh,schoolie/bokeh,DuCorey/bokeh,aiguofer/bokeh,aavanian/bokeh,Karel-van-de-Plassche/bokeh,dennisobrien/bokeh,jakirkham/bokeh,philippjfr/bokeh,philippjfr/bokeh,DuCorey/bokeh,rs2/bokeh,dennisobrien/bokeh,azjps/bokeh,azjps/bokeh,ptitjano/bokeh,phobson/bokeh,justacec/bokeh,msarahan/bokeh,philippjfr/bokeh,KasperPRasmussen/bokeh,rs2/bokeh,phobson/bokeh,aavanian/bokeh,quasiben/bokeh,phobson/bokeh,rs2/bokeh,ptitjano/bokeh,mindriot101/bokeh,ericmjl/bokeh,msarahan/bokeh,ericmjl/bokeh,jakirkham/bokeh,percyfal/bokeh,schoolie/bokeh,dennisobrien/bokeh,quasiben/bokeh