[doc] trivial: Fix broken developer links (#54942)

## Why are these changes needed?
Just getting started and found broken links in the developer guide.

## Related issue number
N/A

## Checks

- [x] I've signed off every commit(by using the -s flag, i.e., `git
commit -s`) in this PR.
- [x] I've run `scripts/format.sh` to lint the changes in this PR.
- [x] I've included any doc changes needed for
https://docs.ray.io/en/master/.
- [x] I've made sure the tests are passing. Note that there might be a
few flaky tests, see the recent failures at https://flakey-tests.ray.io/
- Testing Strategy
   - [x] This PR is not tested :)

Signed-off-by: Šimon Lukašík <isimluk@fedoraproject.org>

Author: isimluk

doc/source/ray-contribute/getting-involved.rst

@@ -47,7 +47,7 @@ What can I work on?
 -------------------
 
 We use Github to track issues, feature requests, and bugs. Take a look at the
-ones labeled `"good first issue" <https://github.com/ray-project/ray/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22>`__ for a place to start.
+ones labeled `"good first issue" <https://github.com/ray-project/ray/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+label%3A%22good-first-issue%22>`__ for a place to start.
 
 Setting up your development environment
 ---------------------------------------

doc/source/tune/faq.rst

@@ -491,7 +491,7 @@ How can I get started contributing to Tune?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 We use Github to track issues, feature requests, and bugs. Take a look at the
-ones labeled `"good first issue" <https://github.com/ray-project/ray/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22>`__ and `"help wanted" <https://github.com/ray-project/ray/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22>`__ for a place to start.
+ones labeled `"good first issue" <https://github.com/ray-project/ray/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+label%3A%22good-first-issue%22>`__ and `"help wanted" <https://github.com/ray-project/ray/issues?q=is%3Aopen+is%3Aissue+label%3A%22help-wanted%22>`__ for a place to start.
 Look for issues with "[tune]" in the title.
 
 .. note::