docs: Clarify boost usage in Reference (#987)

* docs: Clarify boost usage in Reference

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packages/google-cloud-speech/protos/google/cloud/speech/v1p1beta1/resource.proto

@@ -95,8 +95,8 @@ message PhraseSet {
     // boost will simply be ignored. Though `boost` can accept a wide range of
     // positive values, most use cases are best served
     // with values between 0 and 20. We recommend using a binary search approach
-    // to finding the optimal value for your use case. Speech recognition
-    // will skip PhraseSets with a boost value of 0.
+    // to finding the optimal value for your use case as well as adding
+    // phrases both with and without boost to your requests.
     float boost = 2;
   }
 
@@ -113,8 +113,8 @@ message PhraseSet {
   // enabled, so negative boost will simply be ignored. Though `boost` can
   // accept a wide range of positive values, most use cases are best served with
   // values between 0 (exclusive) and 20. We recommend using a binary search
-  // approach to finding the optimal value for your use case. Speech recognition
-  // will skip PhraseSets with a boost value of 0.
+  // approach to finding the optimal value for your use case as well as adding
+  // phrases both with and without boost to your requests.
   float boost = 4;
 }