docs: Use reference instead of deprecated callable in scripts exa…

…mple

docs/pyproject.md

@@ -351,7 +351,7 @@ To specify a script that [depends on an extra](#extras), you may provide an entr
 
 ```toml
 [tool.poetry.scripts]
-devtest = { callable = "mypackage:test.run_tests", extras = ["test"] }
+devtest = { reference = "mypackage:test.run_tests", extras = ["test"], type = "console" }
 ```
 
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