docs: fix indentation levels in release notes
docs: fix indentation levels in release notes

BubuLK/sfepy,vlukes/sfepy,lokik/sfepy,lokik/sfepy,rc/sfepy,vlukes/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,rc/sfepy,sfepy/sfepy,RexFuzzle/sfepy,lokik/sfepy,lokik/sfepy,BubuLK/sfepy,vlukes/sfepy,rc/sfepy,sfepy/sfepy,sfepy/sfepy,RexFuzzle/sfepy,RexFuzzle/sfepy