fix(docs): Correct link to resources test fixture schema (#1829)

Signed-off-by: Sam Lock <sam@swlock.co.uk>

docs/modules/policies/pages/authoring_tips.adoc

@@ -32,7 +32,7 @@ include::ROOT:partial$attributes.adoc[]
 ** xref:compile.adoc#fixtures[Principal test fixtures]
 *** `{current-testdata-principals-schema-url}`
 ** xref:compile.adoc#fixtures[Resources test fixtures]
-*** `{current-testdata-principals-schema-url}`
+*** `{current-testdata-resources-schema-url}`
 ** xref:compile.adoc#fixtures[Auxiliary data test fixtures]
 *** `{current-testdata-auxdata-schema-url}`
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