second-stage/README-retrain.rst: Update training estimate
second-stage/README-retrain.rst: Update training estimate

antimatter15/charniak-emscripten,antimatter15/charniak-emscripten,antimatter15/charniak-emscripten,dmcc/bllip-parser,BLLIP/bllip-parser,dmcc/bllip-parser,antimatter15/charniak-emscripten,BLLIP/bllip-parser,yv/bllip-parser,yv/bllip-parser,dmcc/bllip-parser,antimatter15/charniak-emscripten,antimatter15/charniak-emscripten,dmcc/bllip-parser,dmcc/bllip-parser,BLLIP/bllip-parser,yv/bllip-parser,yv/bllip-parser,BLLIP/bllip-parser,yv/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,antimatter15/charniak-emscripten,antimatter15/charniak-emscripten,BLLIP/bllip-parser,yv/bllip-parser,antimatter15/charniak-emscripten,dmcc/bllip-parser,yv/bllip-parser,dmcc/bllip-parser,antimatter15/charniak-emscripten,BLLIP/bllip-parser,yv/bllip-parser,dmcc/bllip-parser