fix example code
fix example code

In the AuthorSpider, original css selector failed to get links of author pages
dangra/scrapy,ssteo/scrapy,rolando/scrapy,Parlin-Galanodel/scrapy,rolando-contrib/scrapy,scrapy/scrapy,rootAvish/scrapy,kmike/scrapy,jc0n/scrapy,arush0311/scrapy,umrashrf/scrapy,darkrho/scrapy-scrapy,crasker/scrapy,finfish/scrapy,jc0n/scrapy,scrapy/scrapy,foromer4/scrapy,rolando/scrapy,foromer4/scrapy,Ryezhang/scrapy,rootAvish/scrapy,ArturGaspar/scrapy,shaform/scrapy,kmike/scrapy,w495/scrapy,ssteo/scrapy,shaform/scrapy,finfish/scrapy,kmike/scrapy,umrashrf/scrapy,starrify/scrapy,GregoryVigoTorres/scrapy,rootAvish/scrapy,crasker/scrapy,redapple/scrapy,eLRuLL/scrapy,ArturGaspar/scrapy,pablohoffman/scrapy,w495/scrapy,eLRuLL/scrapy,Parlin-Galanodel/scrapy,pablohoffman/scrapy,wujuguang/scrapy,redapple/scrapy,starrify/scrapy,darkrho/scrapy-scrapy,foromer4/scrapy,umrashrf/scrapy,rolando-contrib/scrapy,taito/scrapy,pablohoffman/scrapy,elacuesta/scrapy,ssteo/scrapy,rolando-contrib/scrapy,crasker/scrapy,darkrho/scrapy-scrapy,elacuesta/scrapy,jc0n/scrapy,arush0311/scrapy,eLRuLL/scrapy,ArturGaspar/scrapy,Ryezhang/scrapy,pawelmhm/scrapy,wenyu1001/scrapy,wujuguang/scrapy,pawelmhm/scrapy,elacuesta/scrapy,dangra/scrapy,GregoryVigoTorres/scrapy,rolando/scrapy,dangra/scrapy,wenyu1001/scrapy,starrify/scrapy,scrapy/scrapy,Parlin-Galanodel/scrapy,Ryezhang/scrapy,w495/scrapy,wenyu1001/scrapy,pawelmhm/scrapy,redapple/scrapy,finfish/scrapy,wujuguang/scrapy,GregoryVigoTorres/scrapy,arush0311/scrapy,shaform/scrapy,taito/scrapy,taito/scrapy