Fix check links (#6910)

CHANGELOG.md

@@ -667,13 +667,13 @@ Check out the [JupyterLab `4.0.0a37` release notes](https://github.com/jupyterla
 ### Maintenance and upkeep improvements
 
 - TST: don't look in user site for serverextensions [#6233](https://github.com/jupyter/notebook/pull/6233) ([@bnavigator](https://github.com/bnavigator))
-- Enable terminal tests as `pywinpty` is ported for python 3.9 [#6228](https://github.com/jupyter/notebook/pull/6228) ([@nsait-linaro](https://github.com/nsait-linaro))
+- Enable terminal tests as `pywinpty` is ported for python 3.9 [#6228](https://github.com/jupyter/notebook/pull/6228) (`@nsait-linaro`)
 
 ### Contributors to this release
 
 ([GitHub contributors page for this release](https://github.com/jupyter/notebook/graphs/contributors?from=2021-10-19&to=2021-11-16&type=c))
 
-[@bnavigator](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Abnavigator+updated%3A2021-10-19..2021-11-16&type=Issues) | [@dleen](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Adleen+updated%3A2021-10-19..2021-11-16&type=Issues) | [@dolfinus](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Adolfinus+updated%3A2021-10-19..2021-11-16&type=Issues) | [@jackexu](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ajackexu+updated%3A2021-10-19..2021-11-16&type=Issues) | [@kevin-bates](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Akevin-bates+updated%3A2021-10-19..2021-11-16&type=Issues) | [@maliubiao](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Amaliubiao+updated%3A2021-10-19..2021-11-16&type=Issues) | [@nsait-linaro](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ansait-linaro+updated%3A2021-10-19..2021-11-16&type=Issues) | [@takluyver](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Atakluyver+updated%3A2021-10-19..2021-11-16&type=Issues) | [@Zsailer](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3AZsailer+updated%3A2021-10-19..2021-11-16&type=Issues)
+[@bnavigator](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Abnavigator+updated%3A2021-10-19..2021-11-16&type=Issues) | [@dleen](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Adleen+updated%3A2021-10-19..2021-11-16&type=Issues) | [@dolfinus](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Adolfinus+updated%3A2021-10-19..2021-11-16&type=Issues) | [@jackexu](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ajackexu+updated%3A2021-10-19..2021-11-16&type=Issues) | [@kevin-bates](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Akevin-bates+updated%3A2021-10-19..2021-11-16&type=Issues) | [@maliubiao](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Amaliubiao+updated%3A2021-10-19..2021-11-16&type=Issues) | `@nsait-linaro` | [@takluyver](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Atakluyver+updated%3A2021-10-19..2021-11-16&type=Issues) | [@Zsailer](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3AZsailer+updated%3A2021-10-19..2021-11-16&type=Issues)
 
 ## 6.4.5