Document opDollar.
Clarify about opDollar without compile-time argument.
Fix wrong example code.
Move opDollar docs to its own section.

Expand with feedback from Kenji, Don, et al.
fix Issue 11130 - Enum members are now all in scope when evaluating enum member initializers
add docs.json/docs-prerelease.json to clean targets
Update attribute.dd

Corrected documentation of attribute `static`.
Removed one "is" in "is is".
Merge pull request #392 from ralphtandetzky/patch-1

Update attribute.dd
Merge pull request #393 from ralphtandetzky/patch-2

Removed one "is" in "is is".
Link to tutorial in navbar
Clarify: char is UTF8 code unit
Merge pull request #395 from qznc/codeunit

Clarify: char is UTF8 code unit
Merge pull request #387 from WalterBright/fix11130

fix Issue 11130 - Enum members are now all in scope when evaluating enum...
bar.obj should be abc.obj

From http://dlang.org/dmd-windows.html , we see "Building Libraries" section, "and existing object file bar.obj and existing library", bar.obj should be abc.obj
Merge pull request #397 from Passw/master

bar.obj should be abc.obj
Merge pull request #390 from dawgfoto/addDDoxToCleanTarget

add docs.json/docs-prerelease.json to clean targets
Update glossary.dd
Merge pull request #398 from torgausen/master

Update glossary.dd
Add 2.064 changelog.