CDRIVER-3326 Document mongoc_client_session_get_server_id

Author: bazile-clyde

src/libmongoc/doc/mongoc_client_session_get_server_id.rst

@@ -0,0 +1,30 @@
+:man_page: mongoc_client_session_get_server_id
+
+mongoc_client_session_get_server_id()
+=====================================
+
+Synopsis
+--------
+
+.. code-block:: c
+
+  uint32_t
+  mongoc_client_session_get_server_id (const mongoc_client_session_t *session);
+
+Get the "server ID" of the ``mongos`` this :symbol:`mongoc_client_session_t` is pinned to.
+
+Parameters
+----------
+
+* ``session``: A :symbol:`mongoc_client_session_t`.
+
+Returns
+-------
+
+A server ID or ``0`` if this :symbol:`mongoc_client_session_t` is not pinned.
+
+.. only:: html
+
+  .. taglist:: See Also:
+    :tags: session
+

src/libmongoc/doc/mongoc_client_session_t.rst

@@ -40,4 +40,5 @@ Example
     mongoc_client_session_get_operation_time
     mongoc_client_session_get_opts
     mongoc_client_session_get_lsid
+    mongoc_client_session_get_server_id
     mongoc_client_session_destroy