fix(pass-style): remove redundant vestigial @returns declaration

[erights]

closes: #XXXX
refs: #1933

Description

The declaration site had both a correct @type declaration and a redundant vestigial partial @returns declaration. Because the latter also was not properly formed, it caused the warning

.../endojs/endo/packages/pass-style/src/remotable.js
  175:1  warning  Missing JSDoc @returns type  jsdoc/require-returns-type

✖ 1 problem (0 errors, 1 warning)

This PR removes it, and does a bit of trivial polishing of the remainder.

Security Considerations

none

Scaling Considerations

none

Documentation Considerations

more accurate type declarations should eventually help documentation

Testing Considerations

none

Upgrade Considerations

none

[turadg]

I'd suggest removing the jsdoc/require-returns-type rule, since it is legitimate to define a type for the return and separately a JSDoc describing it.

[erights]

@turadg , you approved this long ago, but I held it back waiting for endo typing to settle down. Which it has -- thanks!

I'm still getting the same warning, and the same fix still seems correct, so I'm merging this. Also, I have not done anything about the jsdoc/require-returns-type that you suggest removing.

Letting you know because so much has changed since then, even though this still seems good as is.