Add doctest to broadcast_techs, make more generic

Author: tsmbland

src/muse/utilities.py

@@ -201,8 +201,8 @@ def broadcast_over_assets(
     example, it could also be used on a dataset of commodity prices to select prices
     relevant to each asset (e.g. if assets exist in multiple regions).
 
-    This function does not support technologies with a 'year' dimension. Please select
-    technology data for a specific year before calling this function.
+    This function does not support arrays with a 'year' dimension. Please select
+    data for a specific year before calling this function.
 
     Arguments:
         data: The dataset/data-array to broadcast