doc/faq.md: clarify our versioning policy
doc/faq.md: clarify which is the stable version of Neubot
doc/faq.md: the certificate is not invalid, it's just auto-signed
doc/faq.md: FAQ 3.3 grammar nit
doc/faq.md: zap unneeded 'and' in FAQ 3.4
doc/faq.md: FAQ 4.1: better document Neubot behavior on Win32
faq.md: FAQ 4.4: fix command and provide more info on %APPDATA%
doc/faq.md: clarify text of FAQ 4.6
faq.md: FAQ 6.2: direct to more comprehensive data format doc
faq.md: fix some titles and split FAQ 7.2 into subsections
faq.md: grammar in FAQ 8.1
Merge branch 'faq_nits'