TCEs for select command pages (#2824)

* TCEs for select command pages

* Preemptive modifications from previous reviews

* Update to previous commit

doctests/cmds-string.js

@@ -0,0 +1,27 @@
+// EXAMPLE: cmds_string
+// REMOVE_START
+import assert from "node:assert";
+// REMOVE_END
+
+// HIDE_START
+import { createClient } from 'redis';
+
+const client = createClient();
+client.on('error', err => console.log('Redis Client Error', err));
+await client.connect().catch(console.error);
+// HIDE_END
+
+// STEP_START incr
+await client.set("mykey", "10");
+const value1 = await client.incr("mykey");
+console.log(value1);
+// returns 11
+// REMOVE_START
+assert.equal(value1, 11);
+await client.del('mykey');
+// REMOVE_END
+// STEP_END
+
+// HIDE_START
+await client.quit();
+// HIDE_END