Docstring placement.

Note correct docstring placement.  Specifically warn about false
affordance of elided newline `defn` form.
Merge pull request #103 from llasram/docstring-after-fn-name

Docstring placement.
Add missing closing </a>.
Merge pull request #105 from llasram/missing-closing-a

Add missing closing </a>.
Avoid forward references.

Clarify that forward references should be avoided, and `declare` only
used when forward references are actually necessary.