remove system.speech from source-of-truth assembly list (#10893)

Author: gewarren

.github/policies/disallow-edits.yml

@@ -51,9 +51,6 @@ configuration:
               - filesMatchPattern:
                   matchAny: true
                   pattern: xml/System.Runtime.Serialization/XsdDataContractExporter.xml
-              - filesMatchPattern:
-                  matchAny: true
-                  pattern: xml/System.Speech/*
         then:
             - addReply:
                 reply: >-

docfx.json

@@ -158,8 +158,7 @@
         "api/System.Runtime.Serialization.Schema**": false,
         "api/System.Runtime.Serialization.ISerializationCodeDomSurrogateProvider.yml": false,
         "api/System.Runtime.Serialization.ImportOptions.yml": false,
-        "api/System.Runtime.Serialization.XsdDataContractExporter.yml": false,
-        "api/System.Speech**": false
+        "api/System.Runtime.Serialization.XsdDataContractExporter.yml": false
       }
     },
     "dest": "_site",