docs: Fix mailing list typos in committer guide
docs: Fix mailing list typos in committer guide

Closes #1117

andrewsomething/libcloud,mistio/libcloud,Kami/libcloud,apache/libcloud,erjohnso/libcloud,apache/libcloud,pquentin/libcloud,mistio/libcloud,ByteInternet/libcloud,andrewsomething/libcloud,Scalr/libcloud,Scalr/libcloud,apache/libcloud,mistio/libcloud,vongazman/libcloud,ByteInternet/libcloud,StackPointCloud/libcloud,StackPointCloud/libcloud,Kami/libcloud,pquentin/libcloud,vongazman/libcloud,ByteInternet/libcloud,StackPointCloud/libcloud,pquentin/libcloud,erjohnso/libcloud,Scalr/libcloud,andrewsomething/libcloud,Kami/libcloud,erjohnso/libcloud,vongazman/libcloud