doc: add helpful comments in config, add trimming modifiers to fix whitespace

Author: JacobCoffee

salt/haproxy/config/haproxy.cfg.jinja

@@ -126,12 +126,13 @@ frontend main
     # constrained to the host header using the domain key in haproxy.sls
     # then adds a rule to deny via HTTP 429 if the respective ACL is matched and the stick table http request rate
     # is higher than the 'rate_limit' from haproxy.sls pillar date
-    {% for service, config in haproxy.services.items() %}
-    {% if config.get('rate_limit') %}
+    {%- for service, config in haproxy.services.items() %}
+    {%- if config.get('rate_limit') %}
+    # Rate limit config for {{ service }}
     acl is_{{ service }} hdr(host) -i {% for domain in config.domains %}{{ domain }}{% endfor %}
     http-request deny deny_status 429 if is_{{ service }} { sc0_http_req_rate() gt {{ config.rate_limit }} }
-    {% endif %}
-    {% endfor %}
+    {%- endif %}
+    {%- endfor %}
 
     # Custom logging format, this is the same as the normal "httplog" in
     # HAProxy except information about the TLS connection is included.