This change removes all unnessary blockquotes in the generated
html documentation. This was caused by too much whitespace before
doing lists or code blocks. Those blockquotes are easy to grep with:
$ grep -n -R "<blockquote>" --include "*.html"
There is one blockquote left (bug-triage.rst), which is indeed a
paragraph which can be quoted.
Change-Id: Ib84ee3fb95caf2e9a545e1d89f22faf63304ad43