Change type abbreviation for consistency with most other plotly docstrings

Author: joelostblom

packages/python/plotly/plotly/subplots.py

@@ -120,7 +120,7 @@ def make_subplots(
         Empty strings ("") can be included in the list if no subplot title
         is desired in that space so that the titles are properly indexed.
 
-    specs: list of lists of dictionaries or None (default None)
+    specs: list of lists of dict or None (default None)
         Per subplot specifications of subplot type, row/column spanning, and
         spacing.
 
@@ -173,7 +173,7 @@ def make_subplots(
         - Note: Use 'horizontal_spacing' and 'vertical_spacing' to adjust
           the spacing in between the subplots.
 
-    insets: list of dictionaries or None (default None):
+    insets: list of dict or None (default None):
         Inset specifications.  Insets are subplots that overlay grid subplots
 
         - Each item in 'insets' is a dictionary.