docs: Update Heimdall middleware description to clarify body forwarding capability

Jira Ticket: https://linuxfoundation.atlassian.net/browse/LFXV2-257

Signed-off-by: Mauricio Zanetti Salomao <[email protected]>

Author: mauriciozanettisalomao

charts/lfx-platform/templates/heimdall/middleware.yaml

@@ -1,8 +1,8 @@
 # Copyright The Linux Foundation and each contributor to LFX.
 # SPDX-License-Identifier: MIT
----
 {{ if and .Values.heimdall.enabled (or
   .Values.gateway.enabled .Values.lfx.parentGateway.enabled) -}}
+---
 # Heimdall middleware with body forwarding capability
 # This is the default middleware that should be used in most cases, particularly 
 # when parentRef requiring authentication is in the request body.