DOC-4423: add TCEs for various command pages (#2885)

* DOC-4423: add TCEs for various command pages

* fix problematic doctest

from redis docs for ACL DELUSER:
Delete all the specified ACL users and terminate all the connections
 that are authenticated with such users

Nodejs complains: Warning: Detected unsettled top-level await
which in turn gives the error code 13 in the workflow

await client.auth({ username: 'test-user' ...});
// deleting the user that is currently logged in -> bad
await client.sendCommand(['ACL', 'DELUSER', 'test-user']);
await client.quit()

fix: authenticate with the default user before deleting the test-user

---------

Co-authored-by: Nikolay Karadzhov <nkaradzhov89@gmail.com>

doctests/cmds-cnxmgmt.js

@@ -0,0 +1,49 @@
+// EXAMPLE: cmds_cnxmgmt
+// REMOVE_START
+import assert from "node:assert";
+// REMOVE_END
+
+// HIDE_START
+import { createClient } from 'redis';
+
+const client = createClient();
+await client.connect().catch(console.error);
+// HIDE_END
+
+// STEP_START auth1
+// REMOVE_START
+await client.sendCommand(['CONFIG', 'SET', 'requirepass', 'temp_pass']);
+// REMOVE_END
+const res1 = await client.auth({ password: 'temp_pass' });
+console.log(res1); // OK
+
+const res2 = await client.auth({ username: 'default', password: 'temp_pass' });
+console.log(res2); // OK
+
+// REMOVE_START
+assert.equal(res1, "OK");
+assert.equal(res2, "OK");
+await client.sendCommand(['CONFIG', 'SET', 'requirepass', '']);
+// REMOVE_END
+// STEP_END
+
+// STEP_START auth2
+// REMOVE_START
+await client.sendCommand([
+  'ACL', 'SETUSER', 'test-user',
+  'on', '>strong_password', '+acl'
+]);
+// REMOVE_END
+const res3 = await client.auth({ username: 'test-user', password: 'strong_password' });
+console.log(res3); // OK
+
+// REMOVE_START
+assert.equal(res3, "OK");
+await client.auth({ username: 'default', password: '' })
+await client.sendCommand(['ACL', 'DELUSER', 'test-user']);
+// REMOVE_END
+// STEP_END
+
+// HIDE_START
+await client.quit();
+// HIDE_END