Add examples of fake tokens to be used in docs

[ci skip]

doc/development/doc_styleguide.md

@@ -314,6 +314,29 @@ In this case:
 - different highlighting languages are used for each config in the code block
 - the [references](#references) guide is used for reconfigure/restart
 
+## Fake tokens
+
+There may be times where a token is needed to demonstrate an API call using
+cURL or a secret variable used in CI. It is strongly advised not to use real
+tokens in documentation even if the probability of a token being exploited is
+low.
+
+You can use the following fake tokens as examples.
+
+|     **Token type**    |           **Token value**         |
+| --------------------- | --------------------------------- |
+| Private user token    | `9koXpg98eAheJpvBs5tK`            |
+| Personal access token | `n671WNGecHugsdEDPsyo`            |
+| Application ID        | `2fcb195768c39e9a94cec2c2e32c59c0aad7a3365c10892e8116b5d83d4096b6` |
+| Application secret    | `04f294d1eaca42b8692017b426d53bbc8fe75f827734f0260710b83a556082df` |
+| Secret CI variable    | `Li8j-mLUVA3eZYjPfd_H`            |
+| Specific Runner token | `yrnZW46BrtBFqM7xDzE7dddd`        |
+| Shared Runner token   | `6Vk7ZsosqQyfreAxXTZr`            |
+| Trigger token         | `be20d8dcc028677c931e04f3871a9b`  |
+| Webhook secret token  | `6XhDroRcYPM5by_h-HLY`            |
+| Health check token    | `Tu7BgjR9qeZTEyRzGG2P`            |
+| Request profile token | `7VgpS4Ax5utVD2esNstz`            |
+
 ## API
 
 Here is a list of must-have items. Use them in the exact order that appears