new-feature-tutorial.md: Format the diagram in code block

ovn-org · Jul 31, 2020 · 1faadff · 1faadff
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diff --git a/northd/docs/new-feature-tutorial.md b/northd/docs/new-feature-tutorial.md
@@ -16,9 +16,11 @@ output relations (also linked to OVSDB tables), which typically involves
 updating some intermediate relations (i.e., relations declared without `input`
 or `output` qualifiers) in the process:
 
+```
 from OVSDB +----------+   +-----------------+   +-----------+ to OVSDB
 ---------->|Input rels|-->|Intermediate rels|-->|Output rels|---------->
            +----------+   +-----------------+   +-----------+
+```
 
 TODO: the above description ignores the auto-generated plumbing between DDlog
 and OVSDB tables.  Document this plumbing once it has stabilized.