docs/plugins.rst: Document signal name changes
docs/plugins.rst: Document signal name changes

deved69/pelican-1,eevee/pelican,sunzhongwei/pelican,treyhunner/pelican,number5/pelican,jo-tham/pelican,abrahamvarricatt/pelican,sunzhongwei/pelican,jimperio/pelican,number5/pelican,garbas/pelican,simonjj/pelican,HyperGroups/pelican,deanishe/pelican,HyperGroups/pelican,lazycoder-ru/pelican,lazycoder-ru/pelican,florianjacob/pelican,ingwinlu/pelican,joetboole/pelican,ingwinlu/pelican,getpelican/pelican,liyonghelpme/myBlog,jimperio/pelican,UdeskDeveloper/pelican,goerz/pelican,rbarraud/pelican,JeremyMorgan/pelican,rbarraud/pelican,Polyconseil/pelican,kennethlyn/pelican,janaurka/git-debug-presentiation,koobs/pelican,JeremyMorgan/pelican,btnpushnmunky/pelican,iurisilvio/pelican,ehashman/pelican,farseerfc/pelican,jimperio/pelican,iKevinY/pelican,jvehent/pelican,deanishe/pelican,Rogdham/pelican,karlcow/pelican,Rogdham/pelican,deved69/pelican-1,iKevinY/pelican,avaris/pelican,arty-name/pelican,zackw/pelican,Scheirle/pelican,lazycoder-ru/pelican,kernc/pelican,liyonghelpme/myBlog,koobs/pelican,TC01/pelican,lucasplus/pelican,zackw/pelican,iurisilvio/pelican,51itclub/pelican,jvehent/pelican,0xMF/pelican,kernc/pelican,justinmayer/pelican,Scheirle/pelican,Summonee/pelican,JeremyMorgan/pelican,zackw/pelican,rbarraud/pelican,sunzhongwei/pelican,alexras/pelican,catdog2/pelican,51itclub/pelican,getpelican/pelican,GiovanniMoretti/pelican,ls2uper/pelican,11craft/pelican,alexras/pelican,talha131/pelican,douglaskastle/pelican,crmackay/pelican,GiovanniMoretti/pelican,Summonee/pelican,garbas/pelican,Polyconseil/pelican,janaurka/git-debug-presentiation,catdog2/pelican,ehashman/pelican,btnpushnmunky/pelican,51itclub/pelican,fbs/pelican,HyperGroups/pelican,florianjacob/pelican,liyonghelpme/myBlog,douglaskastle/pelican,florianjacob/pelican,sunzhongwei/pelican,lucasplus/pelican,iurisilvio/pelican,GiovanniMoretti/pelican,joetboole/pelican,eevee/pelican,garbas/pelican,levanhien8/pelican,btnpushnmunky/pelican,treyhunner/pelican,goerz/pelican,karlcow/pelican,joetboole/pelican,avaris/pelican,kernc/pelican,11craft/pelican,TC01/pelican,UdeskDeveloper/pelican,karlcow/pelican,11craft/pelican,jvehent/pelican,ehashman/pelican,simonjj/pelican,gymglish/pelican,number5/pelican,kennethlyn/pelican,talha131/pelican,kennethlyn/pelican,abrahamvarricatt/pelican,liyonghelpme/myBlog,goerz/pelican,alexras/pelican,jo-tham/pelican,UdeskDeveloper/pelican,farseerfc/pelican,Summonee/pelican,levanhien8/pelican,lucasplus/pelican,liyonghelpme/myBlog,Scheirle/pelican,janaurka/git-debug-presentiation,catdog2/pelican,ls2uper/pelican,gymglish/pelican,TC01/pelican,Rogdham/pelican,crmackay/pelican,eevee/pelican,deanishe/pelican,gymglish/pelican,douglaskastle/pelican,abrahamvarricatt/pelican,levanhien8/pelican,deved69/pelican-1,treyhunner/pelican,crmackay/pelican,ls2uper/pelican,koobs/pelican,ionelmc/pelican,simonjj/pelican