It's not strange at all. people browse this(java - How to download Javadoc to read offline? - Stack Overflow) page more than 124,000 times. And there are a few aggregate offline manual/reference applications.C++ references(cppreference.com) even have printable versions of every html page. For me personally, offline html is the most convenient format to print out.
pgsql-docs by date:
Соглашаюсь с условиями обработки персональных данных