docs: remove remaining private links

PiperOrigin-RevId: 387857950

Author: Google APIs

google/cloud/retail/v2/search_service.proto

@@ -545,8 +545,7 @@ message SearchRequest {
 
   // The filter syntax consists of an expression language for constructing a
   // predicate from one or more fields of the products being filtered. Filter
-  // expression is case-sensitive. See more details at this [user
-  // guide](/retail/private/docs/filter-and-order#filter).
+  // expression is case-sensitive.
   //
   // If this field is unrecognizable, an INVALID_ARGUMENT is returned.
   string filter = 10;
@@ -564,9 +563,7 @@ message SearchRequest {
 
   // The order in which products are returned. Products can be ordered by
   // a field in an [Product][google.cloud.retail.v2.Product] object. Leave it
-  // unset if ordered by relevance. OrderBy expression is case-sensitive. See
-  // more details at this [user
-  // guide](/retail/private/docs/filter-and-order#order).
+  // unset if ordered by relevance. OrderBy expression is case-sensitive.
   //
   // If this field is unrecognizable, an INVALID_ARGUMENT is returned.
   string order_by = 11;
@@ -585,13 +582,11 @@ message SearchRequest {
   // facet feature.
   DynamicFacetSpec dynamic_facet_spec = 21;
 
-  // Boost specification to boost certain products. See more details at this
-  // [user guide](/retail/private/docs/boosting).
+  // Boost specification to boost certain products.
   BoostSpec boost_spec = 13;
 
   // The query expansion specification that specifies the conditions under which
-  // query expansion will occur. See more details at this [user
-  // guide](/retail/private/docs/result-size#query_expansion).
+  // query expansion will occur.
   QueryExpansionSpec query_expansion_spec = 14;
 
   // The keys to fetch and rollup the matching

google/cloud/retail/v2beta/search_service.proto

@@ -548,8 +548,7 @@ message SearchRequest {
 
   // The filter syntax consists of an expression language for constructing a
   // predicate from one or more fields of the products being filtered. Filter
-  // expression is case-sensitive. See more details at this [user
-  // guide](/retail/private/docs/filter-and-order#filter).
+  // expression is case-sensitive.
   //
   // If this field is unrecognizable, an INVALID_ARGUMENT is returned.
   string filter = 10;
@@ -567,9 +566,7 @@ message SearchRequest {
 
   // The order in which products are returned. Products can be ordered by
   // a field in an [Product][google.cloud.retail.v2beta.Product] object. Leave
-  // it unset if ordered by relevance. OrderBy expression is case-sensitive. See
-  // more details at this [user
-  // guide](/retail/private/docs/filter-and-order#order).
+  // it unset if ordered by relevance. OrderBy expression is case-sensitive.
   //
   // If this field is unrecognizable, an INVALID_ARGUMENT is returned.
   string order_by = 11;
@@ -588,13 +585,11 @@ message SearchRequest {
   // facet feature.
   DynamicFacetSpec dynamic_facet_spec = 21;
 
-  // Boost specification to boost certain products. See more details at this
-  // [user guide](/retail/private/docs/boosting).
+  // Boost specification to boost certain products.
   BoostSpec boost_spec = 13;
 
   // The query expansion specification that specifies the conditions under which
-  // query expansion will occur. See more details at this [user
-  // guide](/retail/private/docs/result-size#query_expansion).
+  // query expansion will occur.
   QueryExpansionSpec query_expansion_spec = 14;
 
   // The keys to fetch and rollup the matching