Removed Type-Defect, Area-Documentation labels.
Added Type-Documentation, Area-Library labels.

We should continually improve all parts of the system, so this bug isn't really saying anything. Unless there are some concrete suggestions for improvement, this issue is impossible to close as fixed, and therefore not really useful.

The only thing useful about this bug is the list of actual pages to concentrate on (the library and 3 classes).

The good:

• dart-collection only has a one-sentence description. Probably fine.
• HashMap has great docs.

The bad:

• Maps doesn't have (any?) docs.
• LinkedList doesn't have many docs.

The Maps class really, really shouldn't exist. It's a left-over from before we had mixins. That said, it exists, so it should be documented (so we can recommend you use MapMixin instead!).

The LinkedList would also be a prime candidate for moving into a package if that ever becomes possible. It is significantly different from the remaining collections in core.
Again, it should still be documented. And maybe copied to package collection, so we can recommend people use that version, in a bid to - eventually - deprecate it.

@lrhn +1 for adding docs that say "you should be using this instead!" and perhaps even adding a @Deprecated('2.0') indicating that it's a candidate for removal in 2.0.

The Maps class has been deleted. LinkedList has great docs on the class, and doc comments on all class members.