update examples

source/includes/run-command.kt

@@ -3,14 +3,11 @@ import org.bson.Document
 
 fun main() {
     //start-execute
-    val command = {
-        find: "restaurants",
-        filter: { cuisine: "Italian" },
-        projection: { name: 1, rating: 1, address: 1 },
-        sort: { name: 1 },
-        limit: 5
-      }
-    val commandResult = database.runCommand(command)
+    val explanation = database.runCommand({
+            explain: {
+                find: 'restaurants'
+            }
+        })
     //end-execute
 
     //start-read-preference

source/run-command.txt

@@ -37,8 +37,8 @@ To run a database command, specify the command and any relevant
 parameters in a document, then pass the document to the ``runCommand()`` method.
 
 The following code shows how you can use the ``runCommand()``
-method to run the ``find`` command, which returns information about
-the current member's role in the replica set, on a database:
+method to run the ``explain`` command, which returns information about
+how the specified CRUD command would be executed:
 
 .. literalinclude:: /includes/run-command.kt
    :start-after: start-execute
@@ -155,9 +155,10 @@ Additional Information
 
 For more information about the concepts in this guide, see the following documentation:
 
-- Kotlin API
+- Kotlin Sync API
    - `runCommand() <{+api+}/com.mongodb.kotlin.client/-mongo-database/run-command.html>`__
 - Database
    - :manual:`Database Commands </reference/command/>`
+   - :manual:`explain Command </reference/command/explain/>`
    - :manual:`hello Command </reference/command/hello/>`
-   - :manual:`find Command </reference/command/find/>`
+   - :manual:`buildInfo Command </reference/command/buildInfo/#mongodb-dbcommand-dbcmd.buildInfo>`