Fixed text and description of B910

README.rst

@@ -273,7 +273,7 @@ on the first line and urls or paths that are on their own line::
       "https://some-super-long-domain-name.com/with/some/very/long/paths"
   )
 
-**B910**: Use Counter() instead of defaultdict(int) to avoid memory leaks. Using the latter can result in using as much as ~1000 MB of memory even for small and simple dicts. Refactoring the code to use the former can reduce memory usage from mentioned ~1000 MB to flat ~20 MB.
+**B910**: Use Counter() instead of defaultdict(int) to avoid excessive memory use as the default dict will record missing keys with the default value when accessed."
 
 
 How to enable opinionated warnings

bugbear.py

@@ -2392,7 +2392,7 @@ def visit_Lambda(self, node) -> None:
     )
 )
 B910 = Error(
-    message="B910 use Counter() instead of defaultdict(int) to avoid memory leaks"
+    message="B910 Use Counter() instead of defaultdict(int) to avoid excessive memory use"
 )
 B950 = Error(message="B950 line too long ({} > {} characters)")