[skip changelog] Update references to docs workflow (#890)

The docs workflow was split into two workflows: publish-docs and validate-docs, but the references to the original workflow were not updated.

Author: per1234

README.md

@@ -7,7 +7,7 @@ tools needed to use any Arduino compatible board and platforms.
 
 [![tests-badge]](https://github.com/Arduino/arduino-cli/actions?workflow=test)
 [![nightly-badge]](https://github.com/Arduino/arduino-cli/actions?workflow=nightly)
-[![docs-badge]](https://github.com/Arduino/arduino-cli/actions?workflow=docs)
+[![docs-badge]](https://github.com/Arduino/arduino-cli/actions?workflow=publish-docs)
 [![codecov-badge]](https://codecov.io/gh/arduino/arduino-cli)
 
 > **Note:** this software is currently under active development: anything can change at any time, API and UI must be
@@ -42,7 +42,7 @@ e-mail contact: security@arduino.cc
 
 [tests-badge]: https://github.com/Arduino/arduino-cli/workflows/test/badge.svg
 [nightly-badge]: https://github.com/Arduino/arduino-cli/workflows/nightly/badge.svg
-[docs-badge]: https://github.com/Arduino/arduino-cli/workflows/docs/badge.svg
+[docs-badge]: https://github.com/Arduino/arduino-cli/workflows/publish-docs/badge.svg
 [codecov-badge]: https://codecov.io/gh/arduino/arduino-cli/branch/master/graph/badge.svg
 [install]: https://arduino.github.io/arduino-cli/installation
 [user documentation]: https://arduino.github.io/arduino-cli/

docs/CONTRIBUTING.md

@@ -281,7 +281,7 @@ case of failures we might ask you to update the PR with correct formatting.
 ### Docs automation
 
 In order to avoid unwanted changes to the public website hosting the Arduino CLI documentation, only Mike is allowed to
-push changes to the `gh-pages` branch, and this only happens from within the CI, in a workflow named [docs][11].
+push changes to the `gh-pages` branch, and this only happens from within the CI, in a workflow named [publish-docs][11].
 
 The CI is responsible for guessing which version of the Arduino CLI we're building docs for, so that generated contents
 will be stored in the appropriate section of the documentation website. Because this guessing might be fairly complex,
@@ -344,7 +344,7 @@ If your PR doesn't need to be included in the changelog, please start the PR tit
 [7]: https://pages.github.com/
 [9]: https://www.mkdocs.org/
 [10]: https://github.com/jimporter/mike
-[11]: https://github.com/arduino/arduino-cli/blob/master/.github/workflows/docs.yaml
+[11]: https://github.com/arduino/arduino-cli/blob/master/.github/workflows/publish-docs.yaml
 [12]: https://github.com/arduino/arduino-cli/blob/master/docs/build.py
 [prettier-website]: https://prettier.io/
 [prettier-vscode-extension]: https://github.com/prettier/prettier-vscode