Add nginx rule when considering large file uploads

doc/administration/settings/continuous_integration.md

@@ -435,11 +435,16 @@ To disable your instance fetching this data:
 
 ## Troubleshooting
 
-### 413 Request Entity Too Large
+### `413 Request Entity Too Large` error
 
-When build jobs fail with the following error,
-increase the [maximum artifacts size](#maximum-artifacts-size).
+If the artifacts are too large, the job might fail with the following error:
 
 ```plaintext
 Uploading artifacts as "archive" to coordinator... too large archive <job-id> responseStatus=413 Request Entity Too Large status=413" at end of a build job on pipeline when trying to store artifacts to <object-storage>.
 ```
+
+You might need to:
+
+- Increase the [maximum artifacts size](#maximum-artifacts-size).
+- If you are using NGINX as a proxy server, increase the file upload size limit which is limited to 1 MB by default.
+  Set a higher value for `client-max-body-size` in the NGINX configuration file.