Fix paragraphs (es)
translate changed default settings of ext/openssl (id)
Fix heading levels in old post
Use br element for line breaks

Replace markdown syntax (2 spaces) with br elements
to avoid confusion with superfluous trailing whitespace.
Remove trailing whitespace
Fix leading whitespace
Fix syntax highlighting in old post
Fix broken inline code in old post
Fix code examples in old post
Merge pull request #892 from kuntoaji/id-default-settings-ext-openssl

translate changed default settings of ext/openssl (id)
Small fixes in news post (id)
Replace kbd elements with inline code spans

Also remove some surplus backslash eascapes;
in code spans they are interpreted as literal backslashes.
Remove kbd element and fix broken markdown

This fixes some links that had been broken for a very long time.
Fix truncated checksum
Remove unnecessary abbr elements
Fix broken abbr elements
Fix broken footnotes
Add Matz's "Patch Writer's Guide" in original form
Add markdown formatting to writing-patches page
Fix typos and grammar on writing-patches page