Troubleshooting: Don't mention number of system tables

The number may change any day, and is not of any value to readers.

Author: hammerhead

docs/admin/troubleshooting/jcmd/index.md

@@ -99,7 +99,7 @@ JDK distribution, and it is integrated into the JVM.
 :::
 
 :::{card} {material-outlined}`receipt_long;1.6em` Diagnosing a Running JVM
-:link: https://www.baeldung.com/running-jvm-diagnose#7-jfr-command-options
+:link: https://www.baeldung.com/running-jvm-diagnose
 This tutorial examines the jcmd utility, its commands, command options, and
 and how to use it.
 :::

docs/admin/troubleshooting/system-tables.rst

@@ -5,8 +5,8 @@
 Diagnostics with System Tables
 ==============================
 
-CrateDB maintains a set of diagnostic tables in the **sys** schema. It
-currently consists of ten tables that provide an overview of the cluster state.
+CrateDB maintains a set of diagnostic tables in the **sys** schema, which
+provide insights into the cluster state.
 
 If something is going wrong, and you initially don't know why, they help you to
 analyze, identify the problem, and start mitigating it. While there is