"Book" link now points to "Books" wiki page
Added changes per Andrei's recommendations and removed Tutorial
Fix line break when using CODE_HIGHLIGHT macro
Struct constructors and static opCall cannot be mixed

Use separate heading for static opCall section.
Fix link.
Fix recursive opCall (oops)
Remove unexpanded CODE_HIGHLIGHT macro in comment

Macros in comments are not expanded (https://issues.dlang.org/show_bug.cgi?id=13211).
Merge pull request #621 from ntrel/patch-1

Remove unexpanded CODE_HIGHLIGHT macro in comment
Merge pull request #619 from ntrel/mix-opcall

Fix Issue 12241 - Document change to static opCall
Merge pull request #610 from JinShil/patch-1

"Book" link now points to "Books" wiki page