Add example for giving an argument a description (#3964)

* Add example for giving an argument a description

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* Update queries.md

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: magicmark

docs/general/queries.md

@@ -101,3 +101,23 @@ class Query:
                 return fruit
         return None
 ```
+
+### Argument Descriptions
+
+Use `Annotated` to give a field argument a description:
+
+```python
+from typing import Annotated
+import strawberry
+
+
+@strawberry.type
+class Query:
+    @strawberry.field
+    def fruit(
+        self,
+        startswith: Annotated[
+            str, strawberry.argument(description="Prefix to filter fruits by.")
+        ],
+    ) -> str | None: ...
+```