fix mistype in doc about \z regexp
fix mistype in doc about \z regexp

replace \Z with regular \z

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onda/rails,utilum/rails,Edouard-chin/rails,88rabbit/newRails,flanger001/rails,lucasmazza/rails,eileencodes/rails,rafaelfranca/omg-rails,samphilipd/rails,yasslab/railsguides.jp,kaspth/rails,mohitnatoo/rails,gauravtiwari/rails,lcreid/rails,flanger001/rails,vipulnsward/rails,Erol/rails,Spin42/rails,iainbeeston/rails,gcourtemanche/rails,tijwelch/rails,Sen-Zhang/rails,odedniv/rails,travisofthenorth/rails,tgxworld/rails,starknx/rails,repinel/rails,jeremy/rails,gfvcastro/rails,MSP-Greg/rails,elfassy/rails,kmcphillips/rails,illacceptanything/illacceptanything,fabianoleittes/rails,kmcphillips/rails,pvalena/rails,jeremy/rails,jeremy/rails,yasslab/railsguides.jp,stefanmb/rails,pvalena/rails,mechanicles/rails,utilum/rails,schuetzm/rails,georgeclaghorn/rails,deraru/rails,iainbeeston/rails,brchristian/rails,Envek/rails,coreyward/rails,travisofthenorth/rails,marklocklear/rails,notapatch/rails,lcreid/rails,travisofthenorth/rails,kddeisz/rails,schuetzm/rails,xlymian/rails,odedniv/rails,maicher/rails,iainbeeston/rails,ttanimichi/rails,illacceptanything/illacceptanything,illacceptanything/illacceptanything,esparta/rails,betesh/rails,koic/rails,coreyward/rails,mijoharas/rails,baerjam/rails,riseshia/railsguides.kr,bogdanvlviv/rails