doc: Error for "." and ".." specifiers differs from documented Resolver Algorithm

- **Version**: ✍️ `16.7.0` - **Platform**: ✍️ `Linux penguin 5.4.119-14945-gafc97d54f809 #1 SMP PREEMPT Tue Aug 10 21:49:04 PDT 2021 x86_64 GNU/Linux` - **Subsystem**: ✍️ `module` ## Location Affected URL(s): - https://nodejs.org/api/esm.html#esm_resolver_algorithm_specification ## Description I'm not sure if this is a bug with the ESM resolver or with the docs but basically if we do: ```js import foo from "."; ``` Then Node throws a `ERR_UNSUPPORTED_DIR_IMPORT` error, based on a reading of the Resolver Algorithm I expected this to be `ERR_INVALID_MODULE_SPECIFIER`. As CommonJS already treats `require(".")` and `require("..")` as directory imports the current behaviour in Node is probably the best, so the docs should be updated to reflect it. This would involve changing ESM_RESOLVE step 3 to: - Otherwise, if specifier starts with "/", "./" or "../", or specifier equals "." or ".." then Although if the current documented behaviour is the intended behaviour then the error needs updating.