Fix filename in runtimeconfig.dev.json breaking change doc (dotnet#31752)

Author: ericstj

docs/core/compatibility/sdk/6.0/runtimeconfigdev-file.md

@@ -9,11 +9,11 @@ The .NET SDK no longer generates the *runtimeconfig.dev.json* file by default. T
 
 ## Previous behavior
 
-An *\[Appname].runtimesettings.dev.json* file was automatically generated at compile time.
+An *\[Appname].runtimeconfig.dev.json* file was automatically generated at compile time.
 
 ## New behavior
 
-The *\[Appname].runtimesettings.dev.json* file is no longer generated by default.
+The *\[Appname].runtimeconfig.dev.json* file is no longer generated by default.
 
 ## Version introduced