docs: add multicall verbose to network API docs

Author: iamdefinitelyahuman

docs/api-network.rst

@@ -1900,6 +1900,21 @@ Multicall Attributes
         ...     brownie.multicall.block_number
         12733683
 
+.. py:attribute:: Multicall.default_verbosity
+
+    Default verbosity setting for multicall. Set to ``False`` by default. If set to ``True``, the content of each batched call is printed to the console. This is useful for debugging, to ensure a multicall is performing as expected.
+
+    .. code-block:: python
+
+        >>> multicall.default_verbosity = True
+
+    You can also enable verbosity for individual multicalls by setting the `verbose` keyword:
+
+    .. code-block:: python
+
+        >>> with brownie.multicall(verbose=True):
+        ...
+
 Multicall Methods
 *****************