Add documentation for PlantUML in reStructuredText

changelogs/unreleased/feature-plantuml-restructured-text.yml

+---
+title: Add documentation for PlantUML in reStructuredText
+merge_request: 13900
+author: Markus Koller
+type: other

doc/administration/integration/plantuml.md

@@ -71,6 +71,15 @@ And in Markdown using fenced code blocks:
     Alice -> Bob : Go Away
     ```
 
+And in reStructuredText using a directive:
+
+```
+.. plantuml::
+
+   Bob -> Alice: hello
+   Alice -> Bob: Go Away
+```
+
 The above blocks will be converted to an HTML img tag with source pointing to the
 PlantUML instance. If the PlantUML server is correctly configured, this should
 render a nice diagram instead of the block:
@@ -94,4 +103,4 @@ Some parameters can be added to the AsciiDoc block definition:
 
 Markdown does not support any parameters and will always use PNG format.
 
-[ce-8537]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8537
+[ce-8537]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/8537
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