rebasing and adding necessary comments

playbooks/roles/nginx/templates/edx/app/nginx/sites-available/lms.j2

@@ -15,21 +15,13 @@ upstream lms-backend {
 # Make Zone
 limit_req_zone $cookie_{{ EDXAPP_SESSION_COOKIE_NAME }} zone=cookies:10m rate={{ EDXAPP_COURSES_REQUEST_RATE }};
 
-# Iterate through the list of User agent and add limit_req_zone for each user agent
-
 {% for agent in EDXAPP_RATE_LIMITED_USER_AGENTS %}
 
-# Map directive is used in the configuration. Map is used to create a variable
-# whose value depends on other variable. So here Map is used actually to 
-# dynamically have different rate limits for different user agents 
-
-
+# Map of http user agent with name limit_bot_agent_alias having binary IP of the agent
 map $http_user_agent {{ "$limit_bot_" ~ agent.alias }} {
           {{ agent.agent_name }} $binary_remote_addr;
       }
 
-# Limit_req_zone for each user agent in EDXAPP_RATE_LIMITED_USER_AGENTS list
-
 limit_req_zone {{ "$limit_bot_" ~ agent.alias }} zone=agents:10m rate={{ agent.rate }};
 {% endfor %}