Fix missing closing code tag.

Starting from `IncompatibleBindings` the docs in https://docs.cloudfoundry.org/devguide/services/application-binding.html are broken. This should fix the broken docs.

Author: beyhan

services/application-binding.html.md.erb

@@ -148,7 +148,7 @@ Service Binding Files:
   foo/binding-guid: 45436ca8-0a7c-45e3-9439-ca1b44db7a2b
 ```
 
-Binding names must match [a-z0-9\-.]{1,253}. Keys resulting in filenames must match [a-z0-9\-._]{1,253}. Invalid binding names and keys result in an <code>IncompatibleBindings<code> error.
+Binding names must match [a-z0-9\-.]{1,253}. Keys resulting in filenames must match [a-z0-9\-._]{1,253}. Invalid binding names and keys result in an <code>IncompatibleBindings</code> error.
 
 ### <a id='arbitrary-params-binding'></a> Arbitrary parameters