Clarify rules:changes warning

doc/ci/yaml/index.md

@@ -3100,7 +3100,7 @@ to specific files.
 WARNING:
 You should use `rules: changes` only with **branch pipelines** or **merge request pipelines**.
 You can use `rules: changes` with other pipeline types, but `rules: changes` always
-evaluates to true when there is no Git `push` event. Tag pipelines, scheduled pipelines,
+evaluates to true when there is no Git `push` event. Tag pipelines, scheduled pipelines, manual pipelines,
 and so on do **not** have a Git `push` event associated with them. A `rules: changes` job
 is **always** added to those pipelines if there is no `if` that limits the job to
 branch or merge request pipelines.