getDocNodes() handles sourceMappingURL poorly, causes bad requests to esm.sh

[mootari]

Describe the bug

@deno/doc/doc also passes sourceMappingURL specifiers to the resolver. If these are relative then they won't be prefixed with ".", which causes the createResolver callback to treat them as absolute paths (see source).

Example (https://esm.sh/effect-web-midi@0.2.1/dist-types/index.d.ts):

export * from './src/index.d.ts';
//# sourceMappingURL=index.d.ts.map

causes a request to be made to https://esm.sh/index.d.ts.map which results in a 400 response.

Additional context

I haven't investigated how the result of getDocNodes gets processed. If source maps have no value, then it may be desirable to simply skip any specifier that ends in .map.

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