revert md file

Author: garysassano

packages/aws-cdk-lib/cx-api/FEATURE_FLAGS.md

@@ -877,7 +877,7 @@ always apply, regardless of the value of this flag.
 
 ### @aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName
 
-*Enable this feature to create default policy names for imported roles that depend on the stack the role is in.*
+*Enable this feature to by default create default policy names for imported roles that depend on the stack the role is in.*
 
 Flag type: Backwards incompatible bugfix