[Docs] Add version footnote to tor.md
[Docs] Add version footnote to tor.md

Added note to section 2, part -edits to `/etc/tor/torrc`- indicating this is only required for Tor version 0.2.7.0 and older, since section 3 states it is valid for Tor version 0.2.7.1 and newer. Added ref link from section 2 version footnote to section 3. Re-styled headings to work on GitHub -alternate heading style markup creation issue with numbered headings and thus headings and automatic heading links are broken- Ref: [Issue# 12376](https://github.com/bitcoin/bitcoin/issues/12376)

Signed-off-by: Damian Williamson <fce61b52c972dfe24effd2100f336c684cdbb58b@live.com.au>

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icoin,GlobalBoost/GlobalBoost,digibyte/digibyte,afk11/bitcoin,MarcoFalke/bitcoin,jmcorgan/bitcoin,anditto/bitcoin,jmcorgan/bitcoin,fujicoin/fujicoin,achow101/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,joshrabinowitz/bitcoin,vertcoin/vertcoin,alecalve/bitcoin,myriadcoin/myriadcoin,donaloconnor/bitcoin,fujicoin/fujicoin,jlopp/statoshi,jnewbery/bitcoin,pataquets/namecoin-core,JeremyRubin/bitcoin,domob1812/huntercore,mruddy/bitcoin,kallewoof/bitcoin,droark/bitcoin,domob1812/bitcoin,h4x3rotab/BTCGPU,prusnak/bitcoin,dscotese/bitcoin,DigitalPandacoin/pandacoin,kazcw/bitcoin,sebrandon1/bitcoin,Sjors/bitcoin,lateminer/bitcoin,DigitalPandacoin/pandacoin,bitcoin/bitcoin,rnicoll/dogecoin,Kogser/bitcoin,alecalve/bitcoin,kazcw/bitcoin,gjhiggins/vcoincore,jonasschnelli/bitcoin,CryptArc/bitcoin,bitcoinknots/bitcoin,domob1812/huntercore,Christewart/bitcoin,mitchellcash/bitcoin,bitcoinknots/bitcoin,sipsorcery/bitcoin,rawodb/bitcoin,vmp32k/litecoin,wellenreiter01/Feathercoin,domob1812/bitcoin,rawodb/bitcoin,untrustbank/litecoin,thrasher-/litecoin,jmcorgan/bitcoin,mm-s/bitcoin,DigitalPandacoin/pandacoin,h4x3rotab/BTCGPU,tjps/bitcoin,jamesob/bitcoin,Bushstar/UFO-Project,GroestlCoin/GroestlCoin,namecoin/namecore,CryptArc/bitcoin,vmp32k/litecoin,anditto/bitcoin,AkioNak/bitcoin,dscotese/bitcoin,anditto/bitcoin,bitcoinsSG/bitcoin,ajtowns/bitcoin,ericshawlinux/bitcoin,kazcw/bitcoin,achow101/bitcoin,namecoin/namecoin-core,domob1812/namecore,digibyte/digibyte,Sjors/bitcoin,jtimon/bitcoin,AkioNak/bitcoin,achow101/bitcoin,mm-s/bitcoin,lateminer/bitcoin,n1bor/bitcoin,FeatherCoin/Feathercoin,Bushstar/UFO-Project,mm-s/bitcoin,jlopp/statoshi,litecoin-project/litecoin,midnightmagic/bitcoin,jambolo/bitcoin,kazcw/bitcoin,FeatherCoin/Feathercoin,bitcoinsSG/bitcoin,DigitalPandacoin/pandacoin,practicalswift/bitcoin,thrasher-/litecoin,mruddy/bitcoin,joshrabinowitz/bitcoin,lbryio/lbrycrd,bespike/litecoin,midnightmagic/bitcoin,gjhiggins/vcoincore,andreaskern/bitcoin,kallewoof/bitcoin,GlobalBoost/GlobalBoost,jlopp/statoshi,ajtowns/bitcoin,Kogser/bitcoin,joshrabinowitz/bitcoin,bitcoin/bitcoin,peercoin/peercoin,mitchellcash/bitcoin,mruddy/bitcoin,ericshawlinux/bitcoin,guncoin/guncoin,rnicoll/bitcoin,Bushstar/UFO-Project,sebrandon1/bitcoin,jambolo/bitcoin,bitcoin/bitcoin,pstratem/bitcoin,EthanHeilman/bitcoin,namecoin/namecoin-core,n1bor/bitcoin,lateminer/bitcoin,Kogser/bitcoin,wellenreiter01/Feathercoin,litecoin-project/litecoin,JeremyRubin/bitcoin,domob1812/bitcoin,bitcoin/bitcoin,jambolo/bitcoin,lbryio/lbrycrd,jtimon/bitcoin,tjps/bitcoin,GlobalBoost/GlobalBoost,Sjors/bitcoin,Xekyo/bitcoin,joshrabinowitz/bitcoin,afk11/bitcoin,practicalswift/bitcoin,prusnak/bitcoin,Flowdalic/bitcoin,OmniLayer/omnicore,lbryio/lbrycrd,yenliangl/bitcoin,r8921039/bitcoin,domob1812/namecore,achow101/bitcoin,Christewart/bitcoin,jlopp/statoshi,monacoinproject/monacoin,pstratem/bitcoin,Flowdalic/bitcoin,namecoin/namecore,rnicoll/bitcoin,thrasher-/litecoin,kallewoof/bitcoin,CryptArc/bitcoin,domob1812/bitcoin,digibyte/digibyte,ajtowns/bitcoin,JeremyRubin/bitcoin,randy-waterhouse/bitcoin,domob1812/bitcoin,n1bor/bitcoin,alecalve/bitcoin,ajtowns/bitcoin,nikkitan/bitcoin,jmcorgan/bitcoin,droark/bitcoin,Christewart/bitcoin,Christewart/bitcoin,Kogser/bitcoin,cdecker/bitcoin,pstratem/bitcoin,litecoin-project/litecoin,OmniLayer/omnicore,Kogser/bitcoin,jtimon/bitcoin,fanquake/bitcoin,kallewoof/bitcoin,bespike/litecoin,n1bor/bitcoin,randy-waterhouse/bitcoin,Sjors/bitcoin,Kogser/bitcoin,vertcoin/vertcoin,jonasschnelli/bitcoin,nikkitan/bitcoin,jonasschnelli/bitcoin,anditto/bitcoin,EthanHeilman/bitcoin,jnewbery/bitcoin,lbryio/lbrycrd,n1bor/bitcoin,tecnovert/particl-core,rawodb/bitcoin,midnightmagic/bitcoin,rawodb/bitcoin,instagibbs/bitcoin,peercoin/peercoin,ahmedbodi/vertcoin,domob1812/bitcoin,pataquets/namecoin-core,guncoin/guncoin,namecoin/namecore,lateminer/bitcoin,rnicoll/dogecoin,namecoin/namecoin-core,lbryio/lbrycrd,Kogser/bitcoin,lateminer/bitcoin,sstone/bitcoin,ahmedbodi/vertcoin,tjps/bitcoin,pataquets/namecoin-core,Xekyo/bitcoin,MeshCollider/bitcoin,jmcorgan/bitcoin,r8921039/bitcoin,kallewoof/bitcoin,donaloconnor/bitcoin,FeatherCoin/Feathercoin,jnewbery/bitcoin,MarcoFalke/bitcoin,pataquets/namecoin-core,RHavar/bitcoin,cdecker/bitcoin,AkioNak/bitcoin,fanquake/bitcoin,fanquake/bitcoin,Flowdalic/bitcoin,particl/particl-core,apoelstra/bitcoin,GroestlCoin/bitcoin,yenliangl/bitcoin,thrasher-/litecoin,myriadcoin/myriadcoin,jonasschnelli/bitcoin,Sjors/bitcoin,nikkitan/bitcoin,digibyte/digibyte,droark/bitcoin,practicalswift/bitcoin,MarcoFalke/bitcoin,ericshawlinux/bitcoin,jmcorgan/bitcoin,rawodb/bitcoin,mm-s/bitcoin,tjps/bitcoin,ElementsProject/elements,qtumproject/qtum,ElementsProject/elements,myriadcoin/myriadcoin,mruddy/bitcoin,MeshCollider/bitcoin,tecnovert/particl-core,jnewbery/bitcoin,donaloconnor/bitcoin,andreaskern/bitcoin,CryptArc/bitcoin,bitcoinsSG/bitcoin,namecoin/namecoin-core,FeatherCoin/Feathercoin,domob1812/huntercore,MeshCollider/bitcoin,domob1812/huntercore,sebrandon1/bitcoin,wellenreiter01/Feathercoin,midnightmagic/bitcoin,myriadteam/myriadcoin,pstratem/bitcoin,ahmedbodi/vertcoin,afk11/bitcoin,sipsorcery/bitcoin,MarcoFalke/bitcoin,apoelstra/bitcoin,cdecker/bitcoin,apoelstra/bitcoin,particl/particl-core,RHavar/bitcoin,particl/particl-core,ElementsProject/elements,droark/bitcoin,jnewbery/bitcoin,jlopp/statoshi,gjhiggins/vcoincore,ElementsProject/elements,wellenreiter01/Feathercoin,sipsorcery/bitcoin,sstone/bitcoin,guncoin/guncoin,litecoin-project/litecoin,GroestlCoin/bitcoin,OmniLayer/omnicore,vmp32k/litecoin,litecoin-project/litecoin,gjhiggins/vcoincore,jamesob/bitcoin,jlopp/statoshi,yenliangl/bitcoin,OmniLayer/omnicore,mm-s/bitcoin