Clarify SSH key docs (#235)

Author: qwerty287

.pre-commit-config.yaml

@@ -18,6 +18,7 @@ repos:
     hooks:
       - id: markdownlint
         exclude: '^CHANGELOG.md$'
+        language_version: 22.15.1
   - repo: https://github.com/mrtazz/checkmake
     rev: 0.2.2
     hooks:

docs.md

@@ -61,6 +61,6 @@ clone:
 | `ref`                     | _none_                              | Set the git reference to retrieve                                                                                                                                          |
 | `path`                    | $CI_WORKSPACE                       | Set destination path to clone to                                                                                                                                           |
 | `use-ssh`                 | `false`                             | Clone using SSH                                                                                                                                                            |
-| `ssh-key`                 | _none_                              | SSH key for SSH clone                                                                                                                                                      |
+| `ssh-key`                 | _none_                              | path to SSH key for SSH clone                                                                                                                                              |
 
 [workflowClone]: https://woodpecker-ci.org/docs/usage/workflow-syntax#clone