4837: Fix parser test directory name in dev docs r=matklad a=jacg

The docs referred to `parser/error` while in reality it is `parser/err`.

Co-authored-by: Jacek Generowicz <jacg@my-post-office.net>
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bors[bot] 2020-06-10 19:29:04 +00:00 committed by GitHub
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@ -308,7 +308,7 @@ The results are 100% Rust specific though.
Test for parser (`ra_parser`) live in `ra_syntax` crate (see `test_data` direcotory).
There are two kinds of tests:
* Manually written test cases in `parser/ok` and `parser/error`
* Manually written test cases in `parser/ok` and `parser/err`
* "Inline" tests in `parser/inline` (these are generated) from comments in `ra_parser` crate.
The purpose of inline tests is not to achieve full coverage by test cases, but to explain to the reader of the code what each particular `if` and `match` is responsible for.