Fix typo in hacking-on-gitea.en-us.md (#15918)

* continously -> continuously
* continous -> continuous

Author: Ikko Ashimine

docs/content/doc/developers/hacking-on-gitea.en-us.md

@@ -127,7 +127,7 @@ See `make help` for all available `make` targets. Also see [`.drone.yml`](https:
 
 ## Building continuously
 
-To run and continously rebuild when source files change:
+To run and continuously rebuild when source files change:
 
 ```bash
 make watch
@@ -216,7 +216,7 @@ You should validate your generated Swagger file and spell-check it with:
 make swagger-validate misspell-check
 ```
 
-You should commit the changed swagger JSON file. The continous integration
+You should commit the changed swagger JSON file. The continuous integration
 server will check that this has been done using:
 
 ```bash
@@ -315,7 +315,7 @@ branches as we will need to update it to main before merging and/or may be
 able to help fix issues directly.
 
 Any PR requires two approvals from the Gitea maintainers and needs to pass the
-continous integration. Take a look at our
+continuous integration. Take a look at our
 [`CONTRIBUTING.md`](https://github.com/go-gitea/gitea/blob/main/CONTRIBUTING.md)
 document.