Fix comments in cpp/include/raft/neighbors/cagra_serialize.cuh (#2283)

Comments in `cpp/include/raft/neighbors/cagra_serialize.cuh` are outdated.

Authors:
  - Yinzuo Jiang (https://github.com/jiangyinzuo)

Approvers:
  - Corey J. Nolet (https://github.com/cjnolet)

URL: #2283

cpp/include/raft/neighbors/cagra_serialize.cuh

@@ -32,14 +32,14 @@ namespace raft::neighbors::cagra {
  *
  * @code{.cpp}
  * #include <raft/core/resources.hpp>
- * #include <raft/neighbors/cagra_serialize.hpp>
+ * #include <raft/neighbors/cagra_serialize.cuh>
  *
  * raft::resources handle;
  *
  * // create an output stream
  * std::ostream os(std::cout.rdbuf());
- * // create an index with `auto index = raft::cagra::build(...);`
- * raft::cagra::serialize(handle, os, index);
+ * // create an index with `auto index = raft::neighbors::cagra::build(...);`
+ * raft::neighbors::cagra::serialize(handle, os, index);
  * @endcode
  *
  * @tparam T data element type
@@ -67,14 +67,14 @@ void serialize(raft::resources const& handle,
  *
  * @code{.cpp}
  * #include <raft/core/resources.hpp>
- * #include <raft/neighbors/cagra_serialize.hpp>
+ * #include <raft/neighbors/cagra_serialize.cuh>
  *
  * raft::resources handle;
  *
  * // create a string with a filepath
  * std::string filename("/path/to/index");
- * // create an index with `auto index = raft::cagra::build(...);`
- * raft::cagra::serialize(handle, filename, index);
+ * // create an index with `auto index = raft::neighbors::cagra::build(...);`
+ * raft::neighbors::cagra::serialize(handle, filename, index);
  * @endcode
  *
  * @tparam T data element type
@@ -102,14 +102,14 @@ void serialize(raft::resources const& handle,
  *
  * @code{.cpp}
  * #include <raft/core/resources.hpp>
- * #include <raft/neighbors/cagra_serialize.hpp>
+ * #include <raft/neighbors/cagra_serialize.cuh>
  *
  * raft::resources handle;
  *
  * // create an output stream
  * std::ostream os(std::cout.rdbuf());
- * // create an index with `auto index = raft::cagra::build(...);`
- * raft::cagra::serialize_to_hnswlib(handle, os, index);
+ * // create an index with `auto index = raft::neighbors::cagra::build(...);`
+ * raft::neighbors::cagra::serialize_to_hnswlib(handle, os, index);
  * @endcode
  *
  * @tparam T data element type
@@ -135,14 +135,14 @@ void serialize_to_hnswlib(raft::resources const& handle,
  *
  * @code{.cpp}
  * #include <raft/core/resources.hpp>
- * #include <raft/neighbors/cagra_serialize.hpp>
+ * #include <raft/neighbors/cagra_serialize.cuh>
  *
  * raft::resources handle;
  *
  * // create a string with a filepath
  * std::string filename("/path/to/index");
- * // create an index with `auto index = raft::cagra::build(...);`
- * raft::cagra::serialize_to_hnswlib(handle, filename, index);
+ * // create an index with `auto index = raft::neighbors::cagra::build(...);`
+ * raft::neighbors::cagra::serialize_to_hnswlib(handle, filename, index);
  * @endcode
  *
  * @tparam T data element type
@@ -168,15 +168,15 @@ void serialize_to_hnswlib(raft::resources const& handle,
  *
  * @code{.cpp}
  * #include <raft/core/resources.hpp>
- * #include <raft/neighbors/cagra_serialize.hpp>
+ * #include <raft/neighbors/cagra_serialize.cuh>
  *
  * raft::resources handle;
  *
  * // create an input stream
  * std::istream is(std::cin.rdbuf());
  * using T    = float; // data element type
  * using IdxT = int; // type of the index
- * auto index = raft::cagra::deserialize<T, IdxT>(handle, is);
+ * auto index = raft::neighbors::cagra::deserialize<T, IdxT>(handle, is);
  * @endcode
  *
  * @tparam T data element type
@@ -200,15 +200,15 @@ index<T, IdxT> deserialize(raft::resources const& handle, std::istream& is)
  *
  * @code{.cpp}
  * #include <raft/core/resources.hpp>
- * #include <raft/neighbors/cagra_serialize.hpp>
+ * #include <raft/neighbors/cagra_serialize.cuh>
  *
  * raft::resources handle;
  *
  * // create a string with a filepath
  * std::string filename("/path/to/index");
  * using T    = float; // data element type
  * using IdxT = int; // type of the index
- * auto index = raft::cagra::deserialize<T, IdxT>(handle, filename);
+ * auto index = raft::neighbors::cagra::deserialize<T, IdxT>(handle, filename);
  * @endcode
  *
  * @tparam T data element type