fix regex structure

Author: cmpadden

Diff for: examples/docs_snippets/docs_snippets/concepts/io_management/test_build_io_context.py

@@ -35,7 +35,7 @@ def cm_resource():
     with pytest.raises(
         DagsterInvariantViolationError,
         match=re.escape(
-            "At least one provided dg.resource is a generator, but attempting to"
+            "At least one provided resource is a generator, but attempting to"
             " access resources outside of context manager scope. You can use the"
             " following syntax to open a context manager: `with"
             " build_input_context(...) as context:`",
@@ -74,7 +74,7 @@ def cm_resource():
     with pytest.raises(
         DagsterInvariantViolationError,
         match=re.escape(
-            "At least one provided dg.resource is a generator, but attempting to"
+            "At least one provided resource is a generator, but attempting to"
             " access resources outside of context manager scope. You can use the"
             " following syntax to open a context manager: `with"
             " build_output_context(...) as context:`",