Update README.md

Author: bitfaster

README.md

@@ -8,9 +8,7 @@ Record high level profiling data in ASP.NET Core applications at runtime. Profil
 
 To use the recorder, register the middleware then request a `BlackBox` recorder at runtime to instrument different subsystems. The blackbox will store a configurable number of request profiles (default is 16).
 
-###
-
-Register types
+### Register types
 
 ```cs
 // use default profile naming (root stack frame will have a name like 'GET relative/url?queryparams')
@@ -82,7 +80,7 @@ builder.Services
     });
 ```
 
-### Profiling controller
+### Add a profiling controller
 
 Add a controller to integrate with speedscope easily at runtime by sending HTTP GET to https://localhost/profile. This controller will first redirect the caller to speedscope with a parameterized profile URL. When speedscope requests the profile data, detect it via the origin header and return the profile.