EV-6784: fix $[prodname] leaking into v3.23 TLS sidebar label

The Operations sidebar entry for Enterprise v3.23 showed the literal
"$[prodname]" because Docusaurus derives the sidebar label from the raw
H1 before the variablesPlugin remark transform runs. Use the literal
"Calico components" in the H1, matching the already-corrected current
source.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 2 people

calico-enterprise_versioned_docs/version-3.23-2/operations/comms/index.mdx

@@ -2,7 +2,7 @@
 description: Provide custom TLS certificates for Calico Enterprise components.
 ---
 
-# Provide TLS certificates for $[prodname] components
+# Provide TLS certificates for Calico components
 
 $[prodname] uses TLS certificates for mutual authentication between components. The operator automatically generates and manages these certificates using a self-signed CA (`tigera-operator-signer`).