Fix typo in kaniko-build-push.md

Fixing a small typo which breaks the How-to Guide if followed blindly/copy-pasted.
The documentation refers to `pipeline,yaml` in line 49, but I believe it should be referring to `pipeline.yaml` ( using a punctuation instead of a comma ).

content/en/docs/How-to guides/kaniko-build-push.md

@@ -46,7 +46,7 @@ this guide.
 
 ## Clone the repository
 
-Create a new Pipeline, `pipeline,yaml`, that uses the *git clone* Task to [clone
+Create a new Pipeline, `pipeline.yaml`, that uses the *git clone* Task to [clone
 the source code from a git repository][tekton-clone]:
 
 ```yaml