ur'string' not needed in Py 2, syntax error in Py3
ur'string' not needed in Py 2, syntax error in Py3

Convert `ur'Scrapy Documentation'`--> `u'Scrapy Documentation'`to be compatible with both Python 2 and Python 3.  See #2891
eLRuLL/scrapy,starrify/scrapy,wujuguang/scrapy,Parlin-Galanodel/scrapy,wujuguang/scrapy,umrashrf/scrapy,finfish/scrapy,dangra/scrapy,ArturGaspar/scrapy,elacuesta/scrapy,kmike/scrapy,elacuesta/scrapy,kmike/scrapy,finfish/scrapy,umrashrf/scrapy,eLRuLL/scrapy,scrapy/scrapy,ArturGaspar/scrapy,scrapy/scrapy,pablohoffman/scrapy,pawelmhm/scrapy,starrify/scrapy,pawelmhm/scrapy,scrapy/scrapy,pablohoffman/scrapy,starrify/scrapy,finfish/scrapy,dangra/scrapy,ssteo/scrapy,umrashrf/scrapy,ssteo/scrapy,pablohoffman/scrapy,elacuesta/scrapy,pawelmhm/scrapy,dangra/scrapy,ArturGaspar/scrapy,Parlin-Galanodel/scrapy,Ryezhang/scrapy,Ryezhang/scrapy,ssteo/scrapy,Parlin-Galanodel/scrapy,eLRuLL/scrapy,Ryezhang/scrapy,kmike/scrapy,wujuguang/scrapy