Decrease range of some fast check diagnostics

[dsherret]

error[zap-not-found-reference]: Could not resolve 'Foo.prototype.bax' referenced from 'Foo.prototype.baz'. This may indicate a bug in Deno. Please open an issue to help us improve if so.
 -->  /Projects/github.com/denoland/deno/foo/main.ts:1:1
  | 
1 | export class Foo {
  | ^^^^^^^^^^^^^^^^^^
2 |   bar: string = "bar";
  | ^^^^^^^^^^^^^^^^^^^^^^
3 |   baz: typeof Foo.prototype.bax = "baz";
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
4 | }
  | ^ this is the reference
  = hint: 

  docs: https://jsr.io/zap/zap-not-found-reference

error[zap-unsupported-using]: Using declarations are not supported in the public API.
 --> /Projects/github.com/denoland/deno/foo/main.ts:5:7
  | 
5 | using baz = "foo";
  |       ^^^^^^^^^^^
  = hint: use 'const' instead of 'using'

  info: using declarations have unclear semantics in the public API
  info: they are thus not supported in the public API
  docs: https://jsr.io/go/zap-unsupported-using