* Fix jsdoc comment parsing initial state
Jsdoc comment parsing can be invoked in two modes:
1. top-level parsing, for comments not inside a tag.
2. tag parsing, for comment that occur after the semantic parts of a
tag.
Top-level parsing skips an initial * because it assumes that it is starting
at the very beginning of a JSDoc comment. Tag parsing does not.
The two modes are distinguished by an optional second parameter named
`margin`. When `margin` is provided, it provides an initial indent used
for comment alignment.
Previously, the check for `margin` was a truthy check `if (margin)`.
This check incorrectly treats `margin=""` the same as
`margin=undefined`.
This PR changes the check to `if (margin !== undefined)`, which
correctly treats `margin=""` the same as `margin=" "`.
* Fixes for broken tests
1. Use SawAsterisk start state.
2. @template needs to skip asterisk in addition to whitespace while
parsing type parameter names.
* undo code move
i.e. use "var v: string" instead of "(var) v: string".
The parens case should only be used when we're using an english description instead of
an actual language construct.
